Machined aluminum upper shock cap for T4 ULP aluminum shock absorbers. Ebony color. Pair of 2. top of the aluminum cap features a tiny vent hole which makes surprise assembly very predictable and simple, since extra surprise oil will escape through this vent hole making sure only the proper amount of the oil is in the shock set up. Machined interior ridges ensure appropriate positioning and sealing for the super-soft silicone membrane.