Features: The material can store light, absorb the light source when there is light, and emit light when it is dark! ! ! 1. Tire Valve Stem Covers: These tire valve stem covers are made of shiny rhinestone material. Give your car a unique luxurious look with a beautiful dazzling glow. 2. Universal Tire Valve Covers: These wheel covers help keep tire inflation at the proper level for bikes, cars, SUVs, trucks and other motor vehicles. 3. Tight leak-proof seal: Our tire valve is stuffed with rubber sealing ring inside, forming a tighter and more effective seal, so it won't leak during long and hard driving. 4. Easy to install - 4 stem caps, can be easily tightened by hand, no additional tools are required, very simple and convenient. 5. The cap size is 15.8*12.8mm. It is universally applicable to standard valves. 6. Prevent dust or snow in the valve from being easily corroded, and prevent foreign objects from blocking the valve core and causing the tire to leak and cause accidents Material: ABS material Color:Orange Notice: Due to manual measurement, please allow 1-3cm error, please make sure you don't mind before placing an order. Please note that there may be chromatic aberrations in the colors due to the position of the image. the product needs to absorb sunlight, you can put it in the sun first, leave it for about one day and then try it at night to see if it glows at night we have checked the goods before shipment, and even if they are irradiated with a flashlight, they can glow because there is phosphor inside the product, the working principle is to absorb light and glow it should be noted that the product packaging should be removed and directly irradiated on the surface of the product and only glow in very dark environments Package Included:4PCS