The 18 mm Blokk features stainless steel ball bearings and an integrated stainless inner race and rivet for optimal strength-to-weight. The 40 mm Blokks feature composite sheaves that spin freely on Delrin® ball bearings with curved bearing races. They have no metal shackles or rivets, making them the lightest soft-attach Blokks Harken has ever designed.
Delrin is a registered trademark of EI du Pont de Nemours and Company or its affiliates.
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