The high-brightness design can be used as a safety light to increase visibility at night and in bad weather to ensure safety.This wheel light is activated by motion sensors , lights turn on when moving; off when stopped.Made of alloy matreial, this product is more durable and sturdy.The length of the product is 3.8cm.It is suitable for American valve and British valve cars, motorcycles, electric cars, bicycles.Item Name: Wheel LightMaterial:AlloySize:Red: 11.95cmx6.15cmx6.05cm/4.7inx2.42inx2.38inBlue: 11.95cmx6.15cmx6.05cm/4.7inx2.42inx2.38inMulticolor: 5cmx3.6cmx1.3cm/1.97inx1.42inx0.51inNotes: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 Wheel Light