Durable Product: Made of premium zinc alloy material which is corrosion resistant, waterproof and high temperature resistant. There's a rotating thread structure inside to prevent air leakage, ensures stability and safety while driving. Also, it protects the valve from being covered by dust, sand, rainwater, extend the longivity of the tire. Advantages: Not only just a cool car exterior decoration and protection for your car, but also shows your unique taste, you can consider it as a gift for your friends and families who loves skull element. Widely Use: Before purchase, make sure your tires have standard American type valves. This cap is measuring 13mm*11mm, General for most cars, vehicles, bicycles, trucks, motorcycles, etc. Easy to Use: 4 caps included in the package. Super convenient to install, you can easily install by yourself and no extra tools required. Satisfaction Guarantee: We offer quality products, our valve stem cap is better than you expect, you can buy with confidence. If you have any issues or questions, feel free to get in touch with us, we will provide you with the best customer service. Ajxn 4 PCS Original American Flag Car Wheel Tire Valve Stem Caps Airtight Dust Proof Covers Universal Tire Air Valve Caps for Cars, Trucks, Bicycles (Red)