Petzl Verso Climbing Belay Device Gray. The asymmetrical V-shaped grooved friction channels adapt the friction for better control using our ARC (Adaptive Rope Control) technology. Specifications for Petzl Verso Climbing Belay Device: Manufacturer: Petzl Fabric/Material: Aluminum Frame Weight: 55 g Belay Type: Manual Catch Climbing Hardware Type: Belay & Rappel Application: Sport Climbing Rappelling Features of Petzl Verso Climbing Belay Device Suitable for a broad range of rope diameters:- Compatible with 8.5 to 11 mm dynamic single ropes - Compatible with 7.1 to 9.2 mm dynamic half ropes- Compatible with 6.9 to 9.2 mm dynamic twin ropes Simple to use:- Feeding slack and catching falls are accomplished using standard belay techniques always keeping a hand on the brake side of the rope- V-shaped friction grooves enable controlled braking- Rope glides smoothly through the device- Can be used to belay a climber and to rappel- Rope installation diagrams for belaying and rappelling engraved on the device Lightweight and durable:- Compact and ultra-lightweight: only 55 g- Rounded design of the rope slots limits wear and extends the life of the device Package Contents: Petzl Verso Climbing Belay Device Petzl D019AA00: Verso Climbing Belay Device Gray