Bike wheel lights are made of alloy material, it is waterproof, effectively protecting valve life, can be installed to any part of the body with slight modifications! The outer is plated with silver, which can flash when running at night, increasing the safety of driving at night. Our bike tire lights are Suitable for cars, motorcycles, electric cars, bicycles. When your wheel starts to move, it automatically flashes and forming an aperture of light which makes your car/motorcycle/bicycle look beautiful and cool. Gain visibility from all directions with bike spoke lights at night, your bike stand out! No tools are needed, just a few seconds to install or remove. Installs on standard tire air stem valves of cars, motorcycles, or bicycles. Please unscrew the lamp before use and remove the middle insulation sheet. if it still not work, you need to put them on the valve stem and ride, it emit a fascinating aura with the vibration of the tires. led flash bike wheel light uses High permeability material, good light transmittance of the lamp , valve cap light can increases nighttime and bad weather visibility in all directions to make you and your loved , and bring more enjoyment to your drive. Material: ABS colour: As shown Package Contents: 4 x LED lamp Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.