【Special Design】 Metal materials are prone to rust in the presence of water and oxygen, which may lead to corrosion on valve body. The plastic inner valve caps design combines the attribution of corrosion resistance of plastic and the stylish look of metal. 【 Premium Material】TZAONEN Valve Stem Caps are made of high-grade light-weight aluminum alloy, anodized & powder coated finish for maximum strength and durability, surface anodic oxidation treatment makes the color brighter. 【 Easy to install】The design of the tire valve cap rotating thread makes it easy to twist when install or remove. 【 Wide Application】 The inner diameter of tire valve caps is 7mm, and the inner height is 13.8mm, so the valve caps universal fit most cars, bicycles, SUVs, trucks, RVs, and other motor vehicles, etc. 【 Why Choose TZAONEN 】 TZAONEN Valve Stem Caps address the challenge that some materials that may be desirable for an exterior of the valve cap can react with the materials commonly used for valve threads, and materials that do not react with the valve thread material may be undesirable for the exterior of the cap for aesthetics or performance reasons.