Light up your kid's bicycle spokes with Spin Brightz! These LED tubes have fun patterns and illuminate the bicycle wheel by creating a ring of color as kids ride. Easy clip-on installation means they're ready to roll in seconds. Once installed, they can select one of the 3 flashing options and they're good to go. DESIGN: 3 flashing speed options Fits 1 standard wheel (16" and up) Quick and easy clip-on installation Tubes are patterned and 4 inches long - Batteries included - 2 CR2032 Weather resistant