Notes: Pls illuminate it with a light source to check the luminous effectBEFORE USE: When installing for the first time, please illuminate the tire valve with light or sunlight for 10-15 seconds, the effect will be brighter at night. Specifications: Package include: 4Pcs/Set* Luminous Car Tire Valve Caps Material: ABS Plastic, phosphor Color: Luminous pink, Luminous red, Luminous green,Luminous blue,Luminous yellow Size: length(1.5cm/0.59inch) Inner diameter(0.8cm/0.3inch) Outer diameter(1.2cm/0.5inch) Feature: 1. Tyre valve tire dust caps can protect tire valve against exposure to dust. 2. You can replace the original bad tire valve caps. 3. The tire valve cap is made of good quality plastic, waterproof,dustproof. 4. Include 4Pcs plastic ABS Luminous valve caps; Can meet your multi purpose. 5. Easy to install; Decorative tires and protective tires. Description: Plastic valve caps: Practical valve caps can protect your valves from dirt and corrosion and help you to replace original bad valve cap of tyre. Good quality material: The valve cap is made of durable plastic which can extend service life of tyre. Wide application: Universal Vehicle and Utility Compatibility. Fit for cars, SUVs, trucks, bikes, motorcycle, and other motor vehicles. About this item: Tire stem valves caps; Our valves caps are made of ABS, can light in the dark and protect the valve, prevent the water, dust or sand into the tire; preventing the valve from leaking, ensure the safe driving. Easy to install: 4pcs luminous valve stem caps can easily tightened use your hand. Beautiful appearance, fits vehicles of various colors. Wide compatibility: Universal size fits more cars, bus trucks, SUVs, motorcycle, bike or bicycle. Perfect gift: The luminous air caps cover is made of durable ABS and luminous powder that glows in the dark and looks very sleek and stylish. It's the perfect gift for friends, bosses, family and more. Happy time: Imagine how happy it is for your car to use our luminous valve caps to shine brightly in the dark.BEFORE USE: Universal Fluorescent Car Tire Valve Caps When installing for the first time, please illuminate the tire valve with light or sunlight for 5-6 Minutes, Universal Fluorescent Car Tire Valve Caps the effect will be brighter at night. (It automatically absorbs and stores light energy, glowing at night)