Light up your spokes with Spin Brightz! These LED tubes illuminate your bicycle wheel by creating a ring of color as you ride. Easy clip-on installation means you're ready to roll in seconds. Once installed, just select one of the 3 flashing options and you're good to go! DESIGN: 3 flashing speed options Fits 1 standard wheel Quick and easy clip-on installation Tubes are 5.5 inches long Batteries included - 2 CR2032 Weather resistant