SP1 Ripper Four75 Runners A-04-0-4-6167 16in. Carbon steel host bar, with a flat top to prevent bar roll during aggressive cornering Carbides are made of yg13 tungsten that provides the ultimate tensile strength for extreme durability and hardness to reduce chipping and increase longevity The 90 degree angle of carbide into the pocket of our runners makes for very large cross sections compared to other designs 1in. Carbide segments allow for flex in ski without compromising carbide