Fun for all ages! This heavy duty zip line pulley, complete with dual stainless steel wheels and sealed stainless steel ball-bearings, is the only choice for those enthusiasts of maximum speed and an adrenaline rush. It has steel side plates, for strength and durability, a handle bar with soft grip for easy handling. Spring loaded frame offers extremely easy on and off. The Z-Max pulley is stable and amazingly fast, complete with three generous attachment points for back up tethers, rescue litters and directional ropes. For 14mm or smaller cables. Do not use this pulley without a harness.