Material: The valve cover is made of chrome plated aluminum alloy, corrosion-resistant and durable. Quantity: 4pcs/package. Design: Universal tire joint-our valve bar cover is universal, very suitable for any car, truck, bicycle, motorcycle, electric car, pickup and other vehicles. Easy to install: only need to be screwed onto the tire valve bar by hand. Function: 1 Protect the valve core from corrosion due to direct contact with clay, water and snow. 2 Prevent tire air leakage and ensure stable tire pressure.