✔Material: made of aluminium, which is sturdy and durable, can provide a long time for you, BUT in order to avoid the ionization fusion between the valve and the car cap, please check the cap every month by removing it and reinstalling | ✔RUBBER SEAL INSIDE - All dust caps for wheels has rubber rings, no air leaking on long, tough drives. | ✔Versatile Application – Along with cars, trucks, SUVs, and RVs, these metal valve stem caps can be used on off-road bicycles, road bikes, motorcycles, and more. | ✔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. | ✔ AFTER SALE: if there is any problem, please contact us at any time, we will solve it immediately!