Rancho RS5000 Series Shocks and Struts are designed with an innovative high-capacity twin-tube construction, a nitro-carburized rod and double-welded loops. All of these components guarantee to deliver superior performance and long-lasting product durability you can count on. These Struts are specially designed to work with Rancho RS5000 Series Shocks. They come packaged with a protective boot for the shock rod and oil seal, so you can relax while driving a long distance and enjoy a smooth ride. If you're still not sure of their quality, then the lifetime warranty that they are backed with will definitely change your mind!