mySimple Products (4 Count) Cool & Custom &ldquo;Hexagon Dome Top&rdquo; Tire Wheel Valve Stem Cap Seal Made of Metal {Blue Color - Metal Internal Threads for Easy Application - Rust Proof - Fits for Most Cars} WARRANTY: This product comes with a lifetime warranty that is guaranteed by the manufacturer. COMPATIBILITY: This product is compatible with almost any automobile, truck, SUV, RV, ATV, motorcycle and bicycle. MATERIALS: This product is made of only the highest quality materials available. No parts of this product are made of toxic or hazardous materials. The businesses this products materials are sourced from are properly vetted by their local governments to ensure that they comply with all labor laws. These valve caps are made in Japan and stored in American facilities. THINGS TO CONSIDER: High-speed pressure loss and core contamination are several of the reasons why valve caps should always be used. In case anything disrupts the valve core's seal, the valve cap provides a backup seal that prevents air from escaping. And while using valve caps will make it take longer to check tire pressures, the consequence of having a tire lose pressure is much worse.