Large Double Prussik Pulley 16mm Rope 4.1 kg to 5.0 kg Installing a genuine GOMBOY replacement Installing a genuine GOMBOY replacement blade restores peak performance 1 Product Type Multifunctional self blocking rope securing device Climbing System Running double rope Compatible Rope Standard EN 1891 Compatible Rope Diameter 11–13mm Connection Ready for use with a single karabiner Release System Ergonomic release handle with rope guide groove Speed Control Thumb brake Brake Pad Material Pock wood Panic Safety Feature No Ideal For Part of ISC’s heavy duty Prussik pulley range while roller bearings are ideal for low loads at high speeds