Sealed bearing prusik minding pulleys are designed to maximize strength while reducing weight. A new standard for high-strength, lightweight pulleys. Weight reduction of up to 35% over pulleys of similar size. Designed specifically for mountain rescue and USAR applications when a lightweight, NFPA G certified pulley is needed. Made using aircraft quality aluminum, this design features a 2.5-inch sheave (full, true 2-inch tread diameter). This diameter sheave is the best compromise for maximizing efficiency while reducing weight and bulk. A unique channel milled into the side of the sheave reduces the effect of debris building up between it and the side plate. The side plate design allows the use of larger ropes in a compact pulley. Manufactured exclusively for Yates by SMC. Certified to NFPA G 1983/2006 ed. Weight 8.5 oz. single, 15 oz. double. Black pulleys have a black sheave.