tire valve caps material : aluminum or copper surface : oxidative,colorful, function : fitting on the tire valve ,protect it from air and dirty,beautiful and fashion . we also can modle according to customers,if you are interested in these ,welcome to contact with me . We are specialized in production of tire valves/motorcycle valves/agriculture tire valve,valve tools,tire repair tools and accessories,passed ISO9001:2000 and TUV quality systerm