16 Pieces tire valve caps aluminium car wheel dustproof cap Sealed shape: The valve stems covers are complete o-ring seal, so it can prevent water, snow, and dust from coming into the tire, thus prolong the tires service life. Wide application: This set of wheel air valve covers fits for many kinds of vehicles with American valves caps, such as cars, trucks, motorcycles, bicycles, electromobile, etc. Specifications: Size (LWH): 1.1 x 1.1 x 1.7 cm/ 0.43 x 0.43 x 0.67 inch Material: aluminium Colors: black Quantity: 16 pieces Package includes: 16 x Black tire valve caps Note: It is normal phenomenon that this wheel air valve cover may fade when exposed to the sun for a long time, please replace or change these wheel air valve covers regularly for better use. The valve caps are made of aluminum alloy, you’d better match them with aluminum valve mouth. The valve cap and valve would stick together if you match them with copper or zinc alloy material.