Double Protection Fluorescent Car Tire Valve Caps: One-piece tire valve stem cover features illuminated plastic inserts and clear housing protection to prevent valve stem corrosion. A good valve cover will prolong the life of the tire. Universal Fluorescent Car Tire Valve Caps: The inner layer of the valve stem cover is designed with luminous material, which can make the car decorated with tire valve stem caps lights at night. When your wheel starts to move, it automatically flashes and creates a circle of light that makes your car/motorcycle/bike look beautiful. These little things are sure to make your night rides cooler. Airtight And Leak Proof Seal: Our tire valves caps inside with the rubber seals, create a tighter, more effective seal, so there?s no air leaking on long, tough drives. Easy to Installation: 4pcs valves stem caps, tire valve stem cap inner protection features a swivel thread design for easy hand tightening during installation. No need any extra tools, very easy and convenient. Widely Used: The size of the tire valve caps is 15.8*12.8mm (H*W), and inner diameter is 8mm.It is universal fits for standard American valves. Fits most cars, buses, SUV, trucks, motorcycles, and bicycles, electric bicycle, etc. Keeping the tires of vehicles at the proper inflating level.It?s also for your families and friends.