Dorman's TPMS Valve Caps are durably constructed from high quality plastic or aluminum to protect valve stems from corrosion. They come with an internal rubber seal for enduring functionality. Available in silver, black, or green (for nitrogen-filled tires) and sold in convenient bulk bags of 50, enough caps are always readily available. The Caps also included in Dorman's TPMS Service Kits and in our TPMS Replacement Hardware Tech Trays.