The GRIGRI 2 assisted braking belay is designed to facilitate belay maneuvers. It works both for the belaying of the first rope and pulley. Can be used with all 8.9-11mm single dynamic strings (optimized for 9.4-10.3mm strings). Compact and lightweight, it will be with you for years so you can scale any wall in the world. Designed for excellent descent control Weight: 170g Rope compatibility: 8.9-11mm diameter single rope Materials: aluminum side plates, stainless steel brake pad and cam, and nylon grip Reinforced Certifications: CE EN 15151, UIAA