The lightweight CRx has a stainless-steel axle and lightweight nylon sheave to maximize efficiency and provide the best strength to weight ratio. Ideal for alpine climbers, mountaineers, or anybody who wants a lightweight utility pulley at a great price point. The CRx's compact size and featherweight belies its solid strength and efficiency; it is stronger than any other pulley in the same size and price range. The side plates are prusik minding for use in a 3 to1 Z haul system. A smooth running 1.25" nylon sheave runs on a stainless steel rivet axle, and the color-contrasting aluminum side plates rotate for easy rope insertion and removal. Easy to use, easy to carry - a great palm-sized partner on the mountain and nearly anywhere else. This pulley is not suitable for use on ziplines, cables or high-speed use. PRODUCT SPECIFICATIONS: Type: Single Axle: Stainless Steel Material: High Quality Aluminum Dimensions: 2.70" x 1.75” x 1.07” Weight: 1.8 oz (52g) Max. Rope: 1/2” (13mm) Sheave: 1.20” Delrin 3 Sigma MBS: 22kN (4,946 lbf) FEATURES AND BENEFITS: Stronger than most of the similar sized pulleys on the market. Meets UIAA127/ EN12278. Compact size fits in pocket or in backpack so that it is always handy for quick access in an emergency. Wide base design has been proven to work efficiently with Prusik cords of up to 8mm. Solid side plates help prevent foreign object access and reduce snags. Side plates are rounded and rotate for easy and secure placement at any point along the rope. Uses durable lightweight nylon bushing for reliable performance at low cost. Made in the USA.