Specifications: Induced vibration type design allows it to light up when the wheels are turning. Premium PVC material makes it wear resistant and anti corrosion.What this valve lamp can bring is to decorate your tires in the dark and warn the surrounding pedestrian and car for safer cycling. Since it is waterproof, it is not easy to damage by rain to extend service life.Made of high quality PVC material, it is durable.The height is 5.8cm.It can be used on the wheels of bicycles, motorcycles, car, trucks, etc. With air nozzle converter, it can be adapted to American and British mouth.Size Details: Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.Package Includes: 2 x Valve Lamps