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"Ronstan's Series 30 Ball Bearing Orbit Blocks boast the highest strength-to-weight ratios on the market. They are made almost entirely of high-tech, composite, polymer materials.Ronstan's two-stage bearing system features high-compression grade Acetal ball bearings and a secondary full contact bearing, which results in minimum friction. They attach with UV-stabilized, multi-strand impregnated Dyneema SK-75 Links. The Links are 10 times stronger and lighter than steel, and provide the final connection from the block to the load point.Use these blocks in mainsheet and spinnaker sheet, halyard, vang, and backstay systems on dinghies and for control line applications on larger boats.This Series 30 Ball Bearing Orbit Block accepts a RF1850S shackle in both orientations to create a conventional loop top block."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.apsltd.com/30mm-orbit-block-single-lashing.html>