In recognition of the unique requirements found in Swift Water 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