1-piece aluminum shock cap for XB8 & GTX Zero Rebound Shocks features a little vent opening that makes surprise assembly extremely predictable and simple, allowing extra shock oil to effortlessly escape. Machined interior ridges guarantee appropriate placement and sealing associated with the super-soft silicone membrane layer. Ebony coated. CNC-machined from premium lightweight 7075 T6 aluminum. Group of 2.