The USP3 shock features a distinctive double O-ring design that prevents oil leaks while delivering optimal friction. Designed to account for oil loss during assembly, it allows you to easily and reliably build the ultimate shock. The shock body continues to feature the Kashima Coat finish, a hallmark of the USP shock series. The shock piston is identical to that of the USP2 shock, utilizing a screw-mounted design that maximizes shock stroke.