Designed for superior load-carrying ability and longevity, the Allen 27mm X 10mm X 4.4mm Dyn Bearing Acetal Sheave utilizes our patented twin rows of stainless-steel ball bearings on a stainless-steel rail. This innovative bearing system outperforms others on the market that use plastic components. The unique design of the ball bearings results in minimal contact between the sheave, bearing, and axle, reducing friction and allowing for faster rolling speeds with less energy. Additionally, the caged ball bearings in this sheave minimize friction even further, thanks to the carefully designed cage that separates the balls and ensures a smooth rolling motion. Experience the benefits of the most efficient shaped bearing with the Allen Dyn Bearing Acetal Sheave.