Designed for Liberator II and III BTH Suspension Headsets for use with Ops-Core FAST, Basejump, Crye Airframe and Highcut Tactical Helmets (not compatible with helmets without cutout above earcup of headset) Can be used with Z-TAC Z039 and Z111 Headsets Kits include four pair (left and right side) Cup Camo Skins. Cup Camo Skins are die cut and are easy to install