【Luminous】Tire valve cap is made of luminous material and comes in two colors, blue and red. At night, it can decorate your car, motorcycle, bicycle nicely. | 【Application】: Inner diameter of the tire air cap cover is 0.32 in/8 mm, outer diameter is 0.51 in/13 mm, inner height is 16 mm. Universal size fits cars, trucks, SUVs, motorcycle and bicycle. | 【Air Tightness】Tire valve stem cover has a luminous plastic insert and a transparent casing, giving you double protection from water, dust or sand entering the tire. | 【Easy to Install】The inside of the valve cap is designed with a rotating thread, which can be tightened by hand without using tools. | 【Notice】The first time you use the luminous valve cap, you need to place it in the sun or light for a while, and it will be brighter at night.