4pcs Tire Valve Stem Caps, Luminous Skull Tire Air Valves Stem Caps, Night Glow Wheels Cap Tire Valve Stem For Car[Material]-- The valve dust cap is made of high-quality and durable ABS plastic, which is dustproof and waterproof and can be used for a long time. [Fluorescent Design]-- The wheel tire valve absorbs light when it is bright, and emits light when it is dark. When your wheel starts to move at night, it will automatically flash and form an aperture, making your car/motorcycle/bicycle look beautiful. You should pay attention to that: before use, the tyre valve stem must be illuminated with strong light, so that the tyre valve can fully absorb the light before it emits light. [Sealing Design]-- The valve cap is elaborately made of rubber sealing design, so it is firmly covered to provide a tighter and more effective seal. It will not leak during long hard driving, protect the valve, effectively prevent dust/snow/rain cover, and extend the tire life. [Easy to Install]-- These tire valve covers can be installed without tools, just remove the existing tire valve covers and tighten them easily by hand. It is also easy to remove when you want to check the air pressure. [Universal Size]-- Universal size, which can be firmly installed on any tire or wheel air valve stem. Suitable for any car, truck, SUV, motorcycle, bicycle or bicycle.