Our tire valve Caps feature a stylish, unique and glossy design. Visually, it will bring a cool appearance to your car and make your car look more beautiful. Warm Notice: To prevent the metal valve cap from fusing with the tire valve stem, please apply grease lubricant onto the threading of the valve stem prior to installation. Aluminum valve caps would be locked if they stay in acid or alkaline liquid environment for a long time, please loosen them at least once per month.