11. High-Quality Materials: Our American Flag Valve Stem Caps are comprised of matte black colored Aluminum with a subdued American Flag design on the top so that you can show your patriotism on the road while maintaining a high degree of style! 22. Wide Compatibility: The inner diameter of tire valve caps is 8mm/0.32inch, and the inner height is 13.5mm/0.53inch. The tire valve stem caps are compatible with all American standard valve stems. Include cars, trucks, bikes, etc. 33. Leakproof Seal: Our tire valve caps feature rubber rings with leak-proof function, create a tighter, more effective seal, and prevent damage to the car due to tire leaks. 44. Easy To Install: 4 valve stem caps, it can be easily tightened by your hand. What is more, paired with a wrench, you can create a tighter and more effective seal. 55. Beautiful Design: Our dust covers for wheels have been designed to show and spread patriotism, perfect for use on Cars, trucks, bicycles, and anything else with a wheel.