Machined aluminum upper surprise limit for T4 ULP aluminum surprise absorbers. Ebony color. Pair of 2. the top of aluminum limit features a small vent opening that produces surprise installation extremely predictable and easy, since excess surprise oil will escape through this vent gap making certain only the proper level of the oil is inside the surprise assembly. Machined interior ridges assure appropriate positioning and sealing regarding the super-soft silicone membrane.