{"product_id":"h3217-black-magic-57mm-hl-double-block-replaces-h1960","title":"Harken 57mm Aluminum Double Block — Swivel - #3217","description":"\u003cp\u003eBlack Magic Air blocks are a top favorite of Big Boat performance racers and cruisers. These lightweight, free-running, powerful performers are used for sail controls that see lots of action: mainsheet, runner, halyard, and spinnaker systems. A center cage keeps Torlon® roller bearings separated and parallel to reduce friction. Shackle blocks lock in two directions or swivel to keep line from twisting. \u003c\/p\u003e\n\n\u003cp\u003eTorlon is a registered trademark of Solvay Advanced Polymers L.L.C.\u003c\/p\u003e","brand":"Harken, Inc.","offers":[{"title":"Default Title","offer_id":41511665991714,"sku":"H3217","price":450.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0267\/1208\/0418\/files\/Harken_3217_-_57mm_Aluminum_Double_Block_with_Swivel.jpg?v=1774631847","url":"https:\/\/sailingservices.com\/products\/h3217-black-magic-57mm-hl-double-block-replaces-h1960","provider":"Sailing Services","version":"1.0","type":"link"}