{"title":"Harken Zircon Pulley Blocks","description":"\u003cp\u003eHarken Zircon blocks are the most advanced small boat blocks Harken has ever produced, and if you're serious about your racing, they're worth every penny. At the heart of every Zircon block is a set of industrial ceramic ball bearings mounted in caged races, a design that reduces friction to levels that simply aren't possible with standard stainless or Delrin bearings. The result is a block that feels extraordinarily free-running in your hands and, more importantly, gives you a level of sensitivity through the sheets that makes it easier to feel load changes and respond to them before the instruments do.\u003c\/p\u003e\n\u003cp\u003eThe Zircon range is available in 40mm and 57mm sheave sizes, in single and double configurations with and without beckets, covering the mainsheet and control line systems where precise, responsive trimming matters most. All Zircon blocks use soft-attach points rather than metal shackles, keeping weight to a minimum and allowing the block to align naturally to the load path.\u003c\/p\u003e\n\u003cp\u003eWe stock the full Harken Zircon range here at Sailing Chandlery, and any order placed by 2pm ships the same working day. If you're not sure whether Zircon is the right choice for your boat or application, just give us a call — we're sailors ourselves and happy to help you make the right decision.\u003c\/p\u003e","products":[{"product_id":"harken-57mm-triple-zircon-block-with-becket","title":"Harken 57mm Triple Zircon Block With Becket","description":"\u003ch2\u003eHarken 57mm Triple Zircon Block With Becket\u003c\/h2\u003e \u003cp\u003eThe Harken Zircon blocks are the most efficient blocks on the market and this helps trimmers match sail shapes to new conditions immediately. The Zircon performance comes from industrial ceramic ball bearings that are mounted in a caged race. The cages keep the bearings separated so they don’t bunch, touch, and stop each other resulting in the most efficient small boat block Harken has ever made. \u003c\/p\u003e \u003cp\u003eThe 57mm Zircon efficiency is great for use on mainsheet systems to reduce friction and increase feeling. Feel any small variation in the breeze.\u003c\/p\u003e \u003ch3\u003eKey Features \u003c\/h3\u003e \u003cul\u003e \u003cli\u003eCeramic Ball Bearings\u003c\/li\u003e \u003cli\u003eVERY free-running block\u003c\/li\u003e \u003cli\u003eLess energy lost to friction\u003c\/li\u003e \u003cul\u003e \u003ch3\u003eSpecifications\u003c\/h3\u003e \u003cul\u003e \u003cli\u003eSheave Ø - 57mm\u003c\/li\u003e \u003cli\u003eLength - 95mm\u003c\/li\u003e \u003cli\u003eWeight - 134g\u003c\/li\u003e \u003cli\u003eMaximum line Ø - 10mm\u003c\/li\u003e \u003cli\u003eMaximum working load - 450kg\u003c\/li\u003e \u003cli\u003eBreaking load - 1350kg\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003e\u003ci\u003ePlease note: This product comes with a lead time expected to be up to 10 working days.\u003c\/i\u003e\u003c\/p\u003e\n\u003c\/ul\u003e\n\u003c\/ul\u003e","brand":"Harken","offers":[{"title":"Default Title","offer_id":55148648989055,"sku":"1213","price":261.43,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0138\/5899\/6288\/files\/df57c958-2615-4c0b-b5e9-4add811fe2bc_6c8c270a-31fc-4a0c-b8c8-5298e9ee91ad.jpg?v=1769581368"},{"product_id":"harken-57mm-triple-zircon-block","title":"Harken 57mm Triple Zircon Block","description":"\u003ch2\u003eHarken 57mm Triple Zircon Block\u003c\/h2\u003e \u003cp\u003eThe Harken Zircon blocks are the most efficient blocks on the market and this helps trimmers match sail shapes to new conditions immediately. The Zircon performance comes from industrial ceramic ball bearings that are mounted in a caged race. The cages keep the bearings separated so they don’t bunch, touch, and stop each other resulting in the most efficient small boat block Harken has ever made. \u003c\/p\u003e \u003cp\u003eThe 57mm Zircon efficiency is great for use on mainsheet systems to reduce friction and increase feeling. Feel any small variation in the breeze.\u003c\/p\u003e \u003ch3\u003eKey Features \u003c\/h3\u003e \u003cul\u003e \u003cli\u003eCeramic Ball Bearings\u003c\/li\u003e \u003cli\u003eVERY free-running block\u003c\/li\u003e \u003cli\u003eLess energy lost to friction\u003c\/li\u003e \u003cul\u003e \u003ch3\u003eSpecifications\u003c\/h3\u003e \u003cul\u003e \u003cli\u003eSheave Ø - 57mm\u003c\/li\u003e \u003cli\u003eLength - 79mm\u003c\/li\u003e \u003cli\u003eWeight - 128g\u003c\/li\u003e \u003cli\u003eMaximum line Ø - 10mm\u003c\/li\u003e \u003cli\u003eMaximum working load - 450kg\u003c\/li\u003e \u003cli\u003eBreaking load - 1350kg\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003e\u003ci\u003ePlease note: This product comes with a lead time expected to be up to 10 working days.\u003c\/i\u003e\u003c\/p\u003e\n\u003c\/ul\u003e\n\u003c\/ul\u003e","brand":"Harken","offers":[{"title":"Default Title","offer_id":55148650037631,"sku":"2199","price":237.14,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0138\/5899\/6288\/files\/6df395c8-f899-4e6a-93c7-a65ca2f9f07a_3286a416-018c-499c-a5f9-d846286a3229.jpg?v=1769581369"},{"product_id":"harken-57mm-double-zircon-block-with-becket","title":"Harken 57mm Double Zircon Block With Becket","description":"\u003ch2\u003eHarken 57mm Double Zircon Block With Becket\u003c\/h2\u003e \u003cp\u003eThe Harken Zircon blocks are the most efficient blocks on the market and this helps trimmers match sail shapes to new conditions immediately. The Zircon performance comes from industrial ceramic ball bearings that are mounted in a caged race. The cages keep the bearings separated so they don’t bunch, touch, and stop each other resulting in the most efficient small boat block Harken has ever made. \u003c\/p\u003e \u003cp\u003eThe 57mm Zircon efficiency is great for use on mainsheet systems to reduce friction and increase feeling. Feel any small variation in the breeze.\u003c\/p\u003e \u003ch3\u003eKey Features \u003c\/h3\u003e \u003cul\u003e \u003cli\u003eCeramic Ball Bearings\u003c\/li\u003e \u003cli\u003eVERY free-running block\u003c\/li\u003e \u003cli\u003eLess energy lost to friction\u003c\/li\u003e \u003cul\u003e \u003ch3\u003eSpecifications\u003c\/h3\u003e \u003cul\u003e \u003cli\u003eSheave Ø - 57mm\u003c\/li\u003e \u003cli\u003eLength - 95mm\u003c\/li\u003e \u003cli\u003eWeight - 92.7g\u003c\/li\u003e \u003cli\u003eMaximum line Ø - 10mm\u003c\/li\u003e \u003cli\u003eMaximum working load - 300kg\u003c\/li\u003e \u003cli\u003eBreaking load - 900kg\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003e\u003ci\u003ePlease note: This product comes with a lead time expected to be up to 10 working days.\u003c\/i\u003e\u003c\/p\u003e\n\u003c\/ul\u003e\n\u003c\/ul\u003e","brand":"Harken","offers":[{"title":"Default Title","offer_id":55148652298623,"sku":"2198","price":167.18,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0138\/5899\/6288\/files\/02934d76-70c7-433a-976f-1706c4c85b88_56ba15d8-9c90-440a-bb9e-fa13812961da.jpg?v=1769581371"},{"product_id":"harken-57mm-double-zircon-block","title":"Harken 57mm Double Zircon Block","description":"\u003ch2\u003eHarken 57mm Double Zircon Block\u003c\/h2\u003e \u003cp\u003eThe Harken Zircon blocks are the most efficient blocks on the market and this helps trimmers match sail shapes to new conditions immediately. The Zircon performance comes from industrial ceramic ball bearings that are mounted in a caged race. The cages keep the bearings separated so they don’t bunch, touch, and stop each other resulting in the most efficient small boat block Harken has ever made. \u003c\/p\u003e \u003cp\u003eThe 57mm Zircon efficiency is great for use on mainsheet systems to reduce friction and increase feeling. Feel any small variation in the breeze.\u003c\/p\u003e \u003ch3\u003eKey Features \u003c\/h3\u003e \u003cul\u003e \u003cli\u003eCeramic Ball Bearings\u003c\/li\u003e \u003cli\u003eVERY free-running block\u003c\/li\u003e \u003cli\u003eLess energy lost to friction\u003c\/li\u003e \u003cul\u003e \u003ch3\u003eSpecifications\u003c\/h3\u003e \u003cul\u003e \u003cli\u003eSheave Ø - 57mm\u003c\/li\u003e \u003cli\u003eLength - 79mm\u003c\/li\u003e \u003cli\u003eWeight - 86.4g\u003c\/li\u003e \u003cli\u003eMaximum line Ø - 10mm\u003c\/li\u003e \u003cli\u003eMaximum working load - 300kg\u003c\/li\u003e \u003cli\u003eBreaking load - 900kg\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003e\u003ci\u003ePlease note: This product comes with a lead time expected to be up to 10 working days.\u003c\/i\u003e\u003c\/p\u003e\n\u003c\/ul\u003e\n\u003c\/ul\u003e","brand":"Harken","offers":[{"title":"Default Title","offer_id":55148652691839,"sku":"2197","price":158.89,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0138\/5899\/6288\/files\/a54712d7-e26c-4d74-bddb-a41d145d581a_9fd92898-8376-485f-97d4-bcbd2e28e331.jpg?v=1769581371"},{"product_id":"harken-57mm-zircon-block-with-becket","title":"Harken 57mm Zircon Block With Becket","description":"\u003ch2\u003eHarken 57mm Zircon Block With Becket\u003c\/h2\u003e \u003cp\u003eThe Harken Zircon blocks are the most efficient blocks on the market and this helps trimmers match sail shapes to new conditions immediately. The Zircon performance comes from industrial ceramic ball bearings that are mounted in a caged race. The cages keep the bearings separated so they don’t bunch, touch, and stop each other resulting in the most efficient small boat block Harken has ever made. \u003c\/p\u003e \u003cp\u003eThe 57mm Zircon efficiency is great for use on mainsheet systems to reduce friction and increase feeling. Feel any small variation in the breeze.\u003c\/p\u003e \u003ch3\u003eKey Features \u003c\/h3\u003e \u003cul\u003e \u003cli\u003eCeramic Ball Bearings\u003c\/li\u003e \u003cli\u003eVERY free-running block\u003c\/li\u003e \u003cli\u003eLess energy lost to friction\u003c\/li\u003e \u003cul\u003e \u003ch3\u003eSpecifications\u003c\/h3\u003e \u003cul\u003e \u003cli\u003eSheave Ø - 57mm\u003c\/li\u003e \u003cli\u003eLength - 95mm\u003c\/li\u003e \u003cli\u003eWeight - 51.4g\u003c\/li\u003e \u003cli\u003eMaximum line Ø - 10mm\u003c\/li\u003e \u003cli\u003eMaximum working load - 150kg\u003c\/li\u003e \u003cli\u003eBreaking load - 450kg\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003e\u003ci\u003ePlease note: This product comes with a lead time expected to be up to 10 working days.\u003c\/i\u003e\u003c\/p\u003e\n\u003c\/ul\u003e\n\u003c\/ul\u003e","brand":"Harken","offers":[{"title":"Default Title","offer_id":55148653478271,"sku":"2196","price":83.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0138\/5899\/6288\/files\/02bff6ca-e798-4876-93ac-8b944c081c0a_9848d4e3-ef70-40a6-bf67-c291a1e3cb70.jpg?v=1769581372"},{"product_id":"harken-57mm-zircon-block","title":"Harken 57mm Zircon Block","description":"\u003ch2\u003eHarken 57mm Zircon Block\u003c\/h2\u003e \u003cp\u003eThe Harken Zircon blocks are the most efficient blocks on the market and this helps trimmers match sail shapes to new conditions immediately. The Zircon performance comes from industrial ceramic ball bearings that are mounted in a caged race. The cages keep the bearings separated so they don’t bunch, touch, and stop each other resulting in the most efficient small boat block Harken has ever made. \u003c\/p\u003e \u003cp\u003eThe 57mm Zircon efficiency is great for use on mainsheet systems to reduce friction and increase feeling. Feel any small variation in the breeze.\u003c\/p\u003e \u003ch3\u003eKey Features \u003c\/h3\u003e \u003cul\u003e \u003cli\u003eCeramic Ball Bearings\u003c\/li\u003e \u003cli\u003eVERY free-running block\u003c\/li\u003e \u003cli\u003eLess energy lost to friction\u003c\/li\u003e \u003cul\u003e \u003ch3\u003eSpecifications\u003c\/h3\u003e \u003cul\u003e \u003cli\u003eSheave Ø - 57mm\u003c\/li\u003e \u003cli\u003eLength - 79mm\u003c\/li\u003e \u003cli\u003eWeight - 44.8g\u003c\/li\u003e \u003cli\u003eMaximum line Ø - 10mm\u003c\/li\u003e \u003cli\u003eMaximum working load - 150kg\u003c\/li\u003e \u003cli\u003eBreaking load - 450kg\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003e\u003ci\u003ePlease note: This product comes with a lead time expected to be up to 10 working days.\u003c\/i\u003e\u003c\/p\u003e\n\u003c\/ul\u003e\n\u003c\/ul\u003e","brand":"Harken","offers":[{"title":"Default Title","offer_id":55148655018367,"sku":"2195","price":80.6,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0138\/5899\/6288\/files\/3af2055d-8ee0-45b9-8552-4649f11a33ab_3b0d268e-01af-4be4-b59f-8e1862c660d5.jpg?v=1769581373"},{"product_id":"harken-40mm-triple-zircon-block-with-becket","title":"Harken 40mm Triple Zircon Block With Becket","description":"\u003ch2\u003eHarken 40mm Triple Zircon Block With Becket\u003c\/h2\u003e \u003cp\u003eThe Harken Zircon blocks are the most efficient blocks on the market and this helps trimmers match sail shapes to new conditions immediately. The Zircon performance comes from industrial ceramic ball bearings that are mounted in a caged race. The cages keep the bearings separated so they don’t bunch, touch, and stop each other resulting in the most efficient small boat block Harken has ever made. \u003c\/p\u003e \u003cp\u003eThe 40mm Zircon efficiency is great for use on mainsheet systems to reduce friction and increase feeling. Feel any small variation in the breeze.\u003c\/p\u003e \u003ch3\u003eKey Features \u003c\/h3\u003e \u003cul\u003e \u003cli\u003eCeramic Ball Bearings\u003c\/li\u003e \u003cli\u003eVERY free-running block\u003c\/li\u003e \u003cli\u003eLess energy lost to friction\u003c\/li\u003e \u003cul\u003e \u003ch3\u003eSpecifications\u003c\/h3\u003e \u003cul\u003e \u003cli\u003eSheave Ø - 40mm\u003c\/li\u003e \u003cli\u003eLength - 73mm\u003c\/li\u003e \u003cli\u003eWeight - 70g\u003c\/li\u003e \u003cli\u003eMaximum line Ø - 8mm\u003c\/li\u003e \u003cli\u003eMaximum working load - 345kg\u003c\/li\u003e \u003cli\u003eBreaking load - 1020kg\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003e\u003ci\u003ePlease note: This product comes with a lead time expected to be up to 10 working days.\u003c\/i\u003e\u003c\/p\u003e\n\u003c\/ul\u003e\n\u003c\/ul\u003e","brand":"Harken","offers":[{"title":"Default Title","offer_id":55148655542655,"sku":"1212","price":194.34,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0138\/5899\/6288\/files\/3c68b9e7-c225-48da-a315-88aff2b76d0d_c8343361-a453-4e61-8feb-90f86f955207.jpg?v=1769581375"},{"product_id":"harken-40mm-triple-zircon-block","title":"Harken 40mm Triple Zircon Block","description":"\u003ch2\u003eHarken 40mm Triple Zircon Block\u003c\/h2\u003e \u003cp\u003eThe Harken Zircon blocks are the most efficient blocks on the market and this helps trimmers match sail shapes to new conditions immediately. The Zircon performance comes from industrial ceramic ball bearings that are mounted in a caged race. The cages keep the bearings separated so they don’t bunch, touch, and stop each other resulting in the most efficient small boat block Harken has ever made. \u003c\/p\u003e \u003cp\u003eThe 40mm Zircon efficiency is great for use on mainsheet systems to reduce friction and increase feeling. Feel any small variation in the breeze.\u003c\/p\u003e \u003ch3\u003eKey Features \u003c\/h3\u003e \u003cul\u003e \u003cli\u003eCeramic Ball Bearings\u003c\/li\u003e \u003cli\u003eVERY free-running block\u003c\/li\u003e \u003cli\u003eLess energy lost to friction\u003c\/li\u003e \u003cul\u003e \u003ch3\u003eSpecifications\u003c\/h3\u003e \u003cul\u003e \u003cli\u003eSheave Ø - 40mm\u003c\/li\u003e \u003cli\u003eLength - 60mm\u003c\/li\u003e \u003cli\u003eWeight - 66.5g\u003c\/li\u003e \u003cli\u003eMaximum line Ø - 8mm\u003c\/li\u003e \u003cli\u003eMaximum working load - 345kg\u003c\/li\u003e \u003cli\u003eBreaking load - 1020kg\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003e\u003ci\u003ePlease note: This product comes with a lead time expected to be up to 10 working days.\u003c\/i\u003e\u003c\/p\u003e\n\u003c\/ul\u003e\n\u003c\/ul\u003e","brand":"Harken","offers":[{"title":"Default Title","offer_id":55148655935871,"sku":"2194","price":175.84,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0138\/5899\/6288\/files\/31ea7364-622c-4fb9-8bf2-8bb96689fe0b_513a1a0c-536d-4d98-bb8e-9a7cfde69193.jpg?v=1769581376"},{"product_id":"harken-40mm-double-zircon-block-with-becket","title":"Harken 40mm Double Zircon Block With Becket","description":"\u003ch2\u003eHarken 40mm Double Zircon Block With Becket\u003c\/h2\u003e \u003cp\u003eThe Harken Zircon blocks are the most efficient blocks on the market and this helps trimmers match sail shapes to new conditions immediately. The Zircon performance comes from industrial ceramic ball bearings that are mounted in a caged race. The cages keep the bearings separated so they don’t bunch, touch, and stop each other resulting in the most efficient small boat block Harken has ever made. \u003c\/p\u003e \u003cp\u003eThe 40mm Zircon efficiency is great for use on mainsheet systems to reduce friction and increase feeling. Feel any small variation in the breeze.\u003c\/p\u003e \u003ch3\u003eKey Features \u003c\/h3\u003e \u003cul\u003e \u003cli\u003eCeramic Ball Bearings\u003c\/li\u003e \u003cli\u003eVERY free-running block\u003c\/li\u003e \u003cli\u003eLess energy lost to friction\u003c\/li\u003e \u003cul\u003e \u003ch3\u003eSpecifications\u003c\/h3\u003e \u003cul\u003e \u003cli\u003eSheave Ø - 40mm\u003c\/li\u003e \u003cli\u003eLength - 73mm\u003c\/li\u003e \u003cli\u003eWeight - 47.6g\u003c\/li\u003e \u003cli\u003eMaximum line Ø - 8mm\u003c\/li\u003e \u003cli\u003eMaximum working load - 230kg\u003c\/li\u003e \u003cli\u003eBreaking load - 680kg\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003e\u003ci\u003ePlease note: This product comes with a lead time expected to be up to 10 working days.\u003c\/i\u003e\u003c\/p\u003e\n\u003c\/ul\u003e\n\u003c\/ul\u003e","brand":"Harken","offers":[{"title":"Default Title","offer_id":55148659540351,"sku":"2193","price":124.5,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0138\/5899\/6288\/files\/9d6df64d-5110-4bb6-9858-e9c3ee3b726c_a27d4826-0125-4174-9bb4-e20cffc8d0c7.jpg?v=1769581376"},{"product_id":"harken-40mm-double-zircon-block","title":"Harken 40mm Double Zircon Block","description":"\u003ch2\u003eHarken 40mm Double Zircon Block\u003c\/h2\u003e \u003cp\u003eThe Harken Zircon blocks are the most efficient blocks on the market and this helps trimmers match sail shapes to new conditions immediately. The Zircon performance comes from industrial ceramic ball bearings that are mounted in a caged race. The cages keep the bearings separated so they don’t bunch, touch, and stop each other resulting in the most efficient small boat block Harken has ever made. \u003c\/p\u003e \u003cp\u003eThe 40mm Zircon efficiency is great for use on mainsheet systems to reduce friction and increase feeling. Feel any small variation in the breeze.\u003c\/p\u003e \u003ch3\u003eKey Features \u003c\/h3\u003e \u003cul\u003e \u003cli\u003eCeramic Ball Bearings\u003c\/li\u003e \u003cli\u003eVERY free-running block\u003c\/li\u003e \u003cli\u003eLess energy lost to friction\u003c\/li\u003e \u003cul\u003e \u003ch3\u003eSpecifications\u003c\/h3\u003e \u003cul\u003e \u003cli\u003eSheave Ø - 40mm\u003c\/li\u003e \u003cli\u003eLength - 60mm\u003c\/li\u003e \u003cli\u003eWeight - 44.7g\u003c\/li\u003e \u003cli\u003eMaximum line Ø - 8mm\u003c\/li\u003e \u003cli\u003eMaximum working load - 230kg\u003c\/li\u003e \u003cli\u003eBreaking load - 680kg\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003e\u003ci\u003ePlease note: This product comes with a lead time expected to be up to 10 working days.\u003c\/i\u003e\u003c\/p\u003e\n\u003c\/ul\u003e\n\u003c\/ul\u003e","brand":"Harken","offers":[{"title":"Default Title","offer_id":55148659802495,"sku":"2192","price":116.2,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0138\/5899\/6288\/files\/de5a6041-8c1d-48cd-ae00-044acee5d177_1bc81b8f-774c-4de1-bb05-25e03a612cf3.jpg?v=1769581378"},{"product_id":"harken-40mm-zircon-block-with-becket","title":"Harken 40mm Zircon Block With Becket","description":"\u003ch2\u003eHarken 40mm Zircon Block With Becket\u003c\/h2\u003e \u003cp\u003eThe Harken Zircon blocks are the most efficient blocks on the market and this helps trimmers match sail shapes to new conditions immediately. The Zircon performance comes from industrial ceramic ball bearings that are mounted in a caged race. The cages keep the bearings separated so they don’t bunch, touch, and stop each other resulting in the most efficient small boat block Harken has ever made. \u003c\/p\u003e \u003cp\u003eThe 40mm Zircon efficiency is great for use on mainsheet systems to reduce friction and increase feeling. Feel any small variation in the breeze.\u003c\/p\u003e \u003ch3\u003eKey Features \u003c\/h3\u003e \u003cul\u003e \u003cli\u003eCeramic Ball Bearings\u003c\/li\u003e \u003cli\u003eVERY free-running block\u003c\/li\u003e \u003cli\u003eLess energy lost to friction\u003c\/li\u003e \u003cul\u003e \u003ch3\u003eSpecifications\u003c\/h3\u003e \u003cul\u003e \u003cli\u003eSheave Ø - 40mm\u003c\/li\u003e \u003cli\u003eLength - 73mm\u003c\/li\u003e \u003cli\u003eWeight - 26.5g\u003c\/li\u003e \u003cli\u003eMaximum line Ø - 8mm\u003c\/li\u003e \u003cli\u003eMaximum working load - 115kg\u003c\/li\u003e \u003cli\u003eBreaking load - 340kg\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003e\u003ci\u003ePlease note: This product comes with a lead time expected to be up to 10 working days.\u003c\/i\u003e\u003c\/p\u003e\n\u003c\/ul\u003e\n\u003c\/ul\u003e","brand":"Harken","offers":[{"title":"Default Title","offer_id":55148661866879,"sku":"2191","price":71.15,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0138\/5899\/6288\/files\/9de322d0-5af0-430d-bb52-f4b967339520_0b4de180-4e05-4e07-a030-70cff38eb66b.jpg?v=1769581436"},{"product_id":"harken-40mm-zircon-block","title":"Harken 40mm Zircon Block","description":"\u003ch2\u003eHarken 40mm Zircon Block\u003c\/h2\u003e \u003cp\u003eThe Harken Zircon blocks are the most efficient blocks on the market and this helps trimmers match sail shapes to new conditions immediately. The Zircon performance comes from industrial ceramic ball bearings that are mounted in a caged race. The cages keep the bearings separated so they don’t bunch, touch, and stop each other resulting in the most efficient small boat block Harken has ever made. \u003c\/p\u003e \u003cp\u003eThe 40mm Zircon efficiency is great for use on mainsheet systems to reduce friction and increase feeling. Feel any small variation in the breeze.\u003c\/p\u003e \u003ch3\u003eKey Features \u003c\/h3\u003e \u003cul\u003e \u003cli\u003eCeramic Ball Bearings\u003c\/li\u003e \u003cli\u003eVERY free-running block\u003c\/li\u003e \u003cli\u003eLess energy lost to friction\u003c\/li\u003e \u003cul\u003e \u003ch3\u003eSpecifications\u003c\/h3\u003e \u003cul\u003e \u003cli\u003eSheave Ø - 40mm\u003c\/li\u003e \u003cli\u003eLength - 60mm\u003c\/li\u003e \u003cli\u003eWeight - 22.9g\u003c\/li\u003e \u003cli\u003eMaximum line Ø - 8mm\u003c\/li\u003e \u003cli\u003eMaximum working load - 115kg\u003c\/li\u003e \u003cli\u003eBreaking load - 340kg\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003e\u003ci\u003ePlease note: This product comes with a lead time expected to be up to 10 working days.\u003c\/i\u003e\u003c\/p\u003e\n\u003c\/ul\u003e\n\u003c\/ul\u003e","brand":"Harken","offers":[{"title":"Default Title","offer_id":55148662194559,"sku":"2190","price":68.77,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0138\/5899\/6288\/files\/d5bc949a-cb6a-454c-bb5c-3fdc3dc64114_efc7abf9-d8f4-4372-bb78-674ccee71785.jpg?v=1769581437"},{"product_id":"harken-29mm-triple-zircon-block-with-becket","title":"Harken 29mm Triple Zircon Block With Becket","description":"\u003ch2\u003eHarken 29mm Triple Zircon Block With Becket\u003c\/h2\u003e \u003cp\u003eThe Harken Zircon blocks are the most efficient blocks on the market and this helps trimmers match sail shapes to new conditions immediately. The Zircon performance comes from industrial ceramic ball bearings that are mounted in a caged race. The cages keep the bearings separated so they don’t bunch, touch, and stop each other resulting in the most efficient small boat block Harken has ever made. \u003c\/p\u003e \u003ch3\u003eKey Features \u003c\/h3\u003e \u003cul\u003e \u003cli\u003eCeramic Ball Bearings\u003c\/li\u003e \u003cli\u003eVERY free-running block\u003c\/li\u003e \u003cli\u003eLess energy lost to friction\u003c\/li\u003e \u003cul\u003e \u003ch3\u003eSpecifications\u003c\/h3\u003e \u003cul\u003e \u003cli\u003eSheave Ø - 29mm\u003c\/li\u003e \u003cli\u003eLength - 54mm\u003c\/li\u003e \u003cli\u003eWeight - 32.5g\u003c\/li\u003e \u003cli\u003eMaximum line Ø - 6mm\u003c\/li\u003e \u003cli\u003eMaximum working load - 240kg\u003c\/li\u003e \u003cli\u003eBreaking load - 720kg\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003e\u003ci\u003ePlease note: This product comes with a lead time expected to be up to 10 working days.\u003c\/i\u003e\u003c\/p\u003e\n\u003c\/ul\u003e\n\u003c\/ul\u003e","brand":"Harken","offers":[{"title":"Default Title","offer_id":55148662784383,"sku":"1211","price":127.25,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0138\/5899\/6288\/files\/8c08cc2f-f55d-419f-83ad-90c9c83e26c9_0a3c068a-ea72-47bc-b8c1-575f931ffbe9.jpg?v=1769581438"},{"product_id":"harken-29mm-triple-zircon-block","title":"Harken 29mm Triple Zircon Block","description":"\u003ch2\u003eHarken 29mm Triple Zircon Block\u003c\/h2\u003e \u003cp\u003eThe Harken Zircon blocks are the most efficient blocks on the market and this helps trimmers match sail shapes to new conditions immediately. The Zircon performance comes from industrial ceramic ball bearings that are mounted in a caged race. The cages keep the bearings separated so they don’t bunch, touch, and stop each other resulting in the most efficient small boat block Harken has ever made. \u003c\/p\u003e \u003ch3\u003eKey Features \u003c\/h3\u003e \u003cul\u003e \u003cli\u003eCeramic Ball Bearings\u003c\/li\u003e \u003cli\u003eVERY free-running block\u003c\/li\u003e \u003cli\u003eLess energy lost to friction\u003c\/li\u003e \u003cul\u003e \u003ch3\u003eSpecifications\u003c\/h3\u003e \u003cul\u003e \u003cli\u003eSheave Ø - 29mm\u003c\/li\u003e \u003cli\u003eLength - 43mm\u003c\/li\u003e \u003cli\u003eWeight - 30.4g\u003c\/li\u003e \u003cli\u003eMaximum line Ø - 6mm\u003c\/li\u003e \u003cli\u003eMaximum working load - 240kg\u003c\/li\u003e \u003cli\u003eBreaking load - 720kg\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003e\u003ci\u003ePlease note: This product comes with a lead time expected to be up to 10 working days.\u003c\/i\u003e\u003c\/p\u003e\n\u003c\/ul\u003e\n\u003c\/ul\u003e","brand":"Harken","offers":[{"title":"Default Title","offer_id":55148664095103,"sku":"2189","price":120.31,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0138\/5899\/6288\/files\/de4e2514-0db7-4594-af13-edb05d392c5d_f6187fe4-1575-4b15-9372-94c5635247f0.jpg?v=1769581439"},{"product_id":"harken-29mm-double-zircon-block-with-becket","title":"Harken 29mm Double Zircon Block With Becket","description":"\u003ch2\u003eHarken 29mm Double Zircon Block With Becket\u003c\/h2\u003e \u003cp\u003eThe Harken Zircon blocks are the most efficient blocks on the market and this helps trimmers match sail shapes to new conditions immediately. The Zircon performance comes from industrial ceramic ball bearings that are mounted in a caged race. The cages keep the bearings separated so they don’t bunch, touch, and stop each other resulting in the most efficient small boat block Harken has ever made. \u003c\/p\u003e \u003ch3\u003eKey Features \u003c\/h3\u003e \u003cul\u003e \u003cli\u003eCeramic Ball Bearings\u003c\/li\u003e \u003cli\u003eVERY free-running block\u003c\/li\u003e \u003cli\u003eLess energy lost to friction\u003c\/li\u003e \u003cul\u003e \u003ch3\u003eSpecifications\u003c\/h3\u003e \u003cul\u003e \u003cli\u003eSheave Ø - 29mm\u003c\/li\u003e \u003cli\u003eLength - 54mm\u003c\/li\u003e \u003cli\u003eWeight - 22.5g\u003c\/li\u003e \u003cli\u003eMaximum line Ø - 6mm\u003c\/li\u003e \u003cli\u003eMaximum working load - 160kg\u003c\/li\u003e \u003cli\u003eBreaking load - 480kg\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003e\u003ci\u003ePlease note: This product comes with a lead time expected to be up to 10 working days.\u003c\/i\u003e\u003c\/p\u003e\n\u003c\/ul\u003e\n\u003c\/ul\u003e","brand":"Harken","offers":[{"title":"Default Title","offer_id":55148664881535,"sku":"2188","price":93.7,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0138\/5899\/6288\/files\/88ae1317-61d0-4fb8-8e8f-e3fd61c4fd9d_78be17db-f598-4588-b0df-f73ec03fa293.jpg?v=1769581440"},{"product_id":"harken-29mm-double-zircon-block","title":"Harken 29mm Double Zircon Block","description":"\u003ch2\u003eHarken 29mm Double Zircon Block\u003c\/h2\u003e \u003cp\u003eThe Harken Zircon blocks are the most efficient blocks on the market and this helps trimmers match sail shapes to new conditions immediately. The Zircon performance comes from industrial ceramic ball bearings that are mounted in a caged race. The cages keep the bearings separated so they don’t bunch, touch, and stop each other resulting in the most efficient small boat block Harken has ever made. \u003c\/p\u003e \u003ch3\u003eKey Features \u003c\/h3\u003e \u003cul\u003e \u003cli\u003eCeramic Ball Bearings\u003c\/li\u003e \u003cli\u003eVERY free-running block\u003c\/li\u003e \u003cli\u003eLess energy lost to friction\u003c\/li\u003e \u003cul\u003e \u003ch3\u003eSpecifications\u003c\/h3\u003e \u003cul\u003e \u003cli\u003eSheave Ø - 29mm\u003c\/li\u003e \u003cli\u003eLength - 43mm\u003c\/li\u003e \u003cli\u003eWeight - 20.4g\u003c\/li\u003e \u003cli\u003eMaximum line Ø - 6mm\u003c\/li\u003e \u003cli\u003eMaximum working load - 160kg\u003c\/li\u003e \u003cli\u003eBreaking load - 480kg\u003c\/li\u003e \u003c\/ul\u003e\n\u003c\/ul\u003e\n\u003c\/ul\u003e","brand":"Harken","offers":[{"title":"Default Title","offer_id":55148667601279,"sku":"2187","price":72.77,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0138\/5899\/6288\/files\/4f257591-cb57-4da8-bf3f-0734b0b35508_a26ae7c2-0171-4271-9024-b87bba757bd6.jpg?v=1769581441"},{"product_id":"harken-29mm-zircon-block-with-becket","title":"Harken 29mm Zircon Block With Becket","description":"\u003ch2\u003eHarken 29mm Zircon Block With Becket\u003c\/h2\u003e \u003cp\u003eThe Harken Zircon blocks are the most efficient blocks on the market and this helps trimmers match sail shapes to new conditions immediately. The Zircon performance comes from industrial ceramic ball bearings that are mounted in a caged race. The cages keep the bearings separated so they don’t bunch, touch, and stop each other resulting in the most efficient small boat block Harken has ever made. \u003c\/p\u003e \u003cp\u003eThe 29mm Zircon efficiency is great for use on the Laser Outhaul to reduce friction in the system when letting you sail out. Use with take-up systems where crucial seconds are lost with traditional plastic and stainless steel ball-bearing blocks will snag.\u003c\/p\u003e \u003ch3\u003eKey Features \u003c\/h3\u003e \u003cul\u003e \u003cli\u003eCeramic Ball Bearings\u003c\/li\u003e \u003cli\u003eVERY free-running block\u003c\/li\u003e \u003cli\u003eLess energy lost to friction\u003c\/li\u003e \u003cul\u003e \u003ch3\u003eSpecifications\u003c\/h3\u003e \u003cul\u003e \u003cli\u003eSheave Ø - 29mm\u003c\/li\u003e \u003cli\u003eLength - 54mm\u003c\/li\u003e \u003cli\u003eWeight - 12.6g\u003c\/li\u003e \u003cli\u003eMaximum line Ø - 6mm\u003c\/li\u003e \u003cli\u003eMaximum working load - 80kg\u003c\/li\u003e \u003cli\u003eBreaking load - 240kg\u003c\/li\u003e \u003c\/ul\u003e\n\u003c\/ul\u003e\n\u003c\/ul\u003e","brand":"Harken","offers":[{"title":"Default Title","offer_id":55148671500671,"sku":"2186","price":45.23,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0138\/5899\/6288\/files\/b90f59d6-17f1-4b13-bb3a-403d44c7f32c_08478b49-c474-4b81-800a-998e34b06d61.jpg?v=1769581442"},{"product_id":"harken-29mm-zircon-block","title":"Harken 29mm Zircon Block","description":"\u003ch2\u003eHarken 29mm Zircon Block\u003c\/h2\u003e \u003cp\u003eThe Harken Zircon blocks are the most efficient blocks on the market and this helps trimmers match sail shapes to new conditions immediately. The Zircon performance comes from industrial ceramic ball bearings that are mounted in a caged race. The cages keep the bearings separated so they don’t bunch, touch, and stop each other resulting in the most efficient small boat block Harken has ever made. \u003c\/p\u003e \u003cp\u003eThe 29mm Zircon efficiency is great for use on the Laser Outhaul to reduce friction in the system when letting you sail out. Use with take-up systems where crucial seconds are lost with traditional plastic and stainless steel ball-bearing blocks will snag.\u003c\/p\u003e \u003ch3\u003eKey Features \u003c\/h3\u003e \u003cul\u003e \u003cli\u003eCeramic Ball Bearings\u003c\/li\u003e \u003cli\u003eVERY free-running block\u003c\/li\u003e \u003cli\u003eLess energy lost to friction\u003c\/li\u003e \u003cul\u003e \u003ch3\u003eSpecifications\u003c\/h3\u003e \u003cul\u003e \u003cli\u003eSheave Ø - 29mm\u003c\/li\u003e \u003cli\u003eLength - 43mm\u003c\/li\u003e \u003cli\u003eWeight - 10.5g\u003c\/li\u003e \u003cli\u003eMaximum line Ø - 6mm\u003c\/li\u003e \u003cli\u003eMaximum working load - 80kg\u003c\/li\u003e \u003cli\u003eBreaking load - 240kg\u003c\/li\u003e \u003c\/ul\u003e\n\u003c\/ul\u003e\n\u003c\/ul\u003e","brand":"Harken","offers":[{"title":"Default Title","offer_id":55148672352639,"sku":"2185","price":41.3,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0138\/5899\/6288\/files\/deb3ebfe-7d97-4bac-93de-476dd49a90f1_804981d8-8827-4e4c-a4da-a85c66775612.jpg?v=1769581443"},{"product_id":"harken9-18mm-zircon-twisted-fiddle-block","title":"Harken 29\/18mm Zircon Twisted Fiddle Block","description":"\u003ch2\u003eHarken 29\/18mm Zircon Twisted Fiddle Block - 1251\u003c\/h2\u003e \u003cp\u003eThe 1251 Twisted Fiddle is a true Zircon block with a unique twist.\u003c\/p\u003e \u003cp\u003eIts slim shape slides easily along the purchase system it inhabits, to remain upright where conventional double blocks tip, twist, or tangle. A fiddle is a better choice where the line moves in uneven sequence around the two Zircon sheaves.\u003c\/p\u003e \u003cp\u003eThis Block is the mid block found in the Harken Fly Vang Pack\u003c\/p\u003e \u003ch3\u003eSpecifications\u003c\/h3\u003e \u003cul\u003e \u003cli\u003eSheave Ø - 29mm and 18mm\u003c\/li\u003e \u003cli\u003eLength - 66mm\u003c\/li\u003e \u003cli\u003eWeight - 18.2g\u003c\/li\u003e \u003cli\u003eMaximum line Ø - 5mm\u003c\/li\u003e \u003cli\u003eMaximum working load - 91kg\u003c\/li\u003e \u003cli\u003eBreaking load - 273kg\u003c\/li\u003e \u003c\/ul\u003e","brand":"Harken","offers":[{"title":"Default Title","offer_id":56984356651391,"sku":"1251","price":66.37,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0138\/5899\/6288\/files\/56ebf1fe-6daf-4270-b2de-1c82070bfa78.jpg?v=1771493197"}],"url":"https:\/\/www.sailingchandlery.com\/collections\/harken-zircon-pulley-blocks\/57mm.oembed","provider":"Sailing Chandlery","version":"1.0","type":"link"}