The Notch Friction Savers features patented Aluminum Wear Safe Rings that let you know when it's time to retire. Friction Savers are constructed from multi layered, fray resistant, custom Nylon webbing. Install and retrieve from the ground. Protect your climbing line and the tree with durable and rope friendly friction savers with Aluminum Wear Safe Rings. These rings have the industry's first wear indicator mark for increased safety and ease of inspection. Reduces friction during ascent and suitable for use as a false crotch. Prevents damage to tree and climbing line with bright coloration for ease of visibility. Multi-Layered, fray resistant custom Nylon webbing resists twisting. Color coded ends for ease of retrieval. 23kN product rating. Decreased friction for increased efficiency. Small Aluminum WS Ring: 30kN (28mm x 54mm), Large Aluminum WS Ring: 30kN (48mm x 74mm). Meets ANSI standard and CE Certified. Available in 3 lengths: 24”, 36”, 48”.