Tire Valve Stem Caps come with a metal shell and plastic inserts to prevent valve stem corrosion, especially in wet/cold areas. Our tire valve caps are compatible with all standard American Schrader valve stems. This includes cars, SUVs, trucks, RVs, bikes, bicycles and other motorized vehicles. Tire air caps have an inside diameter of 0.31 inches and an inside height of 0.54 inches. The plastic liner has a built-in one-piece seal that is leak-proof. The stem cap is made of lightweight copper. The anodized metal finish looks very sleek and stylish. This is the perfect gift for friends, bosses, family, etc. 1 location includes the shipping cost to US. Orders of 30, 000 pieces or greater are eligible for sea shipping. 100% guarantee for quality. Rush Service.