In recognition of the unique requirements found in Swiftwater Rescue, SMC has created an entirely new pulley for 2005. This aluminum pulley weighs 6 oz. and features a 2" sheave. The anodized aluminum sideplates feature a series of holes which help to minimize the hydroplaning effect that might otherwise occur with a typical pulley. Sideplates are also configured to allow this pulley to work as a Prusik Minding Pulley. Sealed Ball Bearings provide optimal efficiency. Weight: 6 oz. Dimensions: 4.0" x 3.0" x 1.25"Sheave: 2"Material: Anodized Aluminum sideplates, Alum. Sheave & Sealed Ball Bearings. Strength: 7,644 lbs. - 34kN (1 KN = 225lbs.)Rope Size: Up to 13mm or 1/2"