Material: aluminum and plastic, mass: 58cm (L) x 23cm (ladder slide) x 0.5cm (valve cap inner diameter) Easy to install and replace, High quality, small, light, long life. It can flash light as you put it on, a big part for lighting and decorating at night. Skull design wheel valve screw light can be used for car, motorcycle, bicycle, mountain bike, etc. You just have to connect it to the valve hole. Only pull the valve on the blue light Small and exquisite appearance, it is comfortable to wear. It can be installed on the tire of the tire, it will flash when the wheel is rolling. Make your favorite car, motorbike or bike personalized and exciting. Improves the visibility of the nocturnal or bad weather for increased safety. LED lights is turned on while the vehicle is in motion and off when stop- Fitted with three AG10 button cells. The aerial can be used British and American (Not for French Value). Color Blue The package includes: 2 x skull valve caps / wheel lamps 6 x AG10 button batteries Only the above package content, other products are not included. Note: Light 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.