Shells Multi-purpose 9 Super Bright LED RBG Color Chaning 7 Flash Pattern Modes Bike Safety Warning Light With Convex Lens About Shells: Shells Group concentrate on providing various electronic and sports reliable quality comsumer goods with affortable price Made from superior solid plastic material. Waterproof, oil and shock resistance. Suitable for installation in the seat tube diameter of 32MM -35mm. Great for riding and avoid unexpected accidents.Absolute protection of your security. Package including: 1PCS 9 LED Bicycle Rear Light With Mount Clip.