4PCS/Set Universal Wheels Tires Valves Decorative Round Ball Car Van Rustproof Dust Air Leakproof Car Bike Motorcycle Caps Parts//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. 4, To protect and decorate the valve caps with lovely style, and personalized design. Why do we use valve caps? 1, Ensure our traffic safety. Ensure stable tire pressure by protecting the valve core from corrosion due to direct contact with clay, water and snow. 2, Decorate our vehicles! Show our personality! Replace our old valve caps with the new personalized design. 3, Protect the valve core and prolong its life-span. 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. SECOND: To add some oil (edible oil is ok) into the valve cap and then screw it several minutes later. Package includes: 4Pcs * Valve Caps