Ywewy Skull Valve Covers,Air Stem Car Wheel Caps,Crystal eyes (Blue) Material: Zinc Alloy.Strong wear-resistant, anti-corrosion ability is very strong. It is different from other similar products in the market, with shining eyes. 4pcs car tyre valve caps in one pack,approximately 0.88 (oz) per cap. For use on cars,trucks,motorcycles and bicycles Nut diameter:7mm