-- Tire caps are made of Sparkling Rhinestones material, give your car a unique LUXURY look. It’s also a perfect gift for your families and friends.-- The material of the caps is ABS plastic, coated with polymerclay, Anti-Rust can effectively prevent the valve from being covered with dust/snow/rainwater, extend the life of the tire.-- The inside of the cap is rotating thread structure, it can fastened tightly with tire stem, effectively preventing the valve from leaking.-- The size of the cap is 0.59” * 0.51”/ 15*13mm(H*W). It is universal fits for standard American (Schrader) valves. -- You can install it no need any extra tools, very easy and convenient.-- You will receive: package contains 4 pack black diamond valve caps