Universal Fluorescent Car Tire Valve Caps, Luminous Blue Tire Valve Stem Caps, Durable Tire Pressure Caps, Fits Most Cars, Motorcycles, SUV, Trucks, and Bicycles Specification : Purpose: The tire valve caps can protect the tire valve from dirt and dust and extend the service life of the tire. It can also be used to replace the broken original valve cap and keep the wheels working well. Fluorescent Effect: The fluorescent effect on dark roads adds a shiny and luxurious look to your car. Make your night cycling cooler and greater! Durable: Made of high-quality ABS material. Texture design is easy to hold and use. Easy Installation: Easy installation without tools. Simply screw it onto the tire valve stem. It's easy to install or remove when you want to check air pressure. Widely Used: The inner diameter of tire valve caps is 8mm, fits most cars, buses, SUV, trucks, motorcycles, and bicycles, etc., keeping the tires of vehicles at the proper inflating level. Color:Blue,Pink,Green, (Please leave me a NOTE about the color you want,otherwise we'll send them randomly.) Package list: 4PCS Fluorescent Car Tire Valve Caps Notes: 1. Due to manual measurement, please allow an error of 0-1cm. Please make sure you don't mind before bidding. 2. Due to the difference of different monitors, the picture may not reflect the actual color of the product. Thanks! 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