PETZL 25th Anniversary Edition GriGri 2 DURABLE MATERIAL: The GRIGRI 2 is made of aluminum side plates, stainless steel cam and friction plate, and a reinforced nylon handle. ROPE COMPATIBILITY: Optimally used on all 9.4 to 10.3 mm dynamic single ropes (possible for 8.9 mm to 11 mm ropes). EASY TO USE: The GRIGRI 2 uses the same hand motions as with classic belay systems: both hands on the rope. A fall is stopped by tightening the hand on the free end of the rope. LIGHTWEIGHT AND COMPACT: New progressive descent control system the GRIGRI 2 is 20% lighter and 25% smaller. ASSISTED BRAKING: One hand holds the rope and the other uses the handle to unlock the cam. The patented handle design allows a very gradual release of the rope.