Designed to clip quickly and securely onto almost every type of bicycle spoke, Nite Ize See'Em Mini Spoke Lights are brilliant at keeping night and early morning riders safe and visible. When the light is poor, Nite Ize See'Em LEDs turn bicycle wheels from hard to spot to impossible to miss. Easy to attach and reposition, and molded of tough, durable plastic, they're backed with stainless steel clips specially designed to snap securely onto oval, round, and bladed flat bicycle spokes. A bright, long lasting LED powered by a replaceable lithium battery is activated by a simple twist, and can be seen in even the darkest night to keep you visible and safe while riding your bike. Not only that when the wheels are spinning, See'Em create the ultra attention getting effect of a moving circle of light. Use one or several on each wheel to create your own signature bands of color. Package of four includes two red, one green, one blue light. Bright LED illumination. Twist onoff. Glow mode compact, convenient illumination. Battery Run Time: 24 hours. Includes easily replaceable batteries CR 927 3V Lithium. Weather resistant. Easy to attach and remove on most common spoke types oval, round and bladed flat. Product Dimensions: 1 x 1 x .75 single unit Weight: .18 oz single unit. NOT FOR USE WITH CARBON SPOKES.