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Selden lightweight BBB (Ball Bearing Blocks) are to designed give you great bearing strength under moderate and dynamic loads where good sheave rotation and minimal friction are desired.
The 30mm series features stainless steel ball bearing races, ball bearings and reinforcing straps and Acetal sheaves and bearing cages for optimum bearing strength even under high dynamic loads.
They are typically found in mainsheet, spinnaker, and genoa sheet applications in dinghies as well as control line applications.
As an accessory, Selden offers a special insert to lock the shackle swivel in-line or perpendicular to the sheave. The shackle swivels freely when the insert is removed.
