The 4pcs Car Luminous Tire Valve Caps are a must-have accessory for your car, motorcycle, electric vehicle, or bicycle. These valve caps are made of ABS material and weigh only 1.5g each. With a length of 160mm and an aperture of 80mm inner diameter and 120mm outer diameter, they are designed to fit standard valves. What sets these valve caps apart is their luminous feature. The valve core cover is infused with fluorescent powder, which allows it to emit a bright glow in the dark. To activate the luminous effect, simply use a flashlight to irradiate the core cover and then test it in the dark. The valve core cover will absorb the light and emit a strong glow. Please note that the effect may not be as obvious in strong sunlight. In addition to their eye-catching luminous feature, these valve caps also offer practical benefits. They help keep tire inflation at the proper level, ensuring optimal performance for your vehicle. The tire valve is equipped with a rubber sealing ring inside, forming a tight and leak-proof seal. This means that even during long and hard drives, you can trust that these valve caps won't leak. Installing these valve caps is a breeze. They can be easily tightened by hand, without the need for any additional tools. If your original valve cap is relatively firm, we even provide a valve core wrench as a spare. With their universal model and size of 16*12mm, these valve caps are suitable for standard valves. Each package includes 4 luminous valve caps to give your vehicle a unique and luxurious look. Key Features: Luminous valve caps with fluorescent powder for a bright glow in the dark Made of ABS material and weigh only 1.5g each Help keep tire inflation at the proper level Equipped with a rubber sealing ring for a tight and leak-proof seal Easy to install, no additional tools required Universal model and size suitable for standard valves Package includes 4 luminous valve caps Give your vehicle a unique and luxurious look