"MATERIAL: The valve cap is made of fine copper, which is corrosion resistant, durable. TECHNOLOGY: Die cast the copper molding at one time. Plate the surface to avoid metal oxidization, rusting and to improve corrosion resistance, wear resistance, texture and glossiness. Easy installation. With the Rubber Seals inside.Can replace the original bad valve cap of the tyre and also show the beauty characteristic of the tyre. FUNCTIONS: 1.Protecting the valve core , corrosion due to direct contact with clay, water and snow. 2. preventing the flat tire and ensure stable tire pressure. 3. Ensure safe driving. Product description Features: 1, High quality sealing ring inside the valve caps, to prevent the flat tire. 2, Specially designed to replace the plastic caps. Easy to install and safe to use 3, Dust proof: To ensure stable tire pressure by protecting the valve core from corrosion due to direct contact with clay, water and snow. How to maintain the valve caps? To avoid the valve caps’ natural oxidation and corrosion, we should maintain the valve caps with the following methods. 1, Avoid long time exposure of the valve caps to water or snow. 2, To unscrew and clean the valve caps, and to check the tire pressure on a regular basis, say 2-4 weeks/once, so as to prevent the oxidation of the valve cap threads and ensure the tire pressure normal. Package: 4pcs/package"