Product name:Bicycle Reflector Product size: 5*3.5cm/1.96*1.37in Fits seatposts from 27.2 to 31.8mm. Product color: As shown in the figure Product material: ABS product features: 1. HIGH VISIBILITY: This bike reflector is designed to improve visibility when riding at night. The reflective material reflects light effectively, making it easier for other road users to spot you from a distance. 2. EASY TO INSTALL: bike rear warning panel is easy to install on your bike frame or seat post. 3. MULTIFUNCTIONAL DESIGN: This reflector can be used on any type of bike, including mountain bikes, road bikes bikes. Its compact size and lightweight construction will not affect the performance of your bike or add unnecessary weight. 4. DURABLE CONSTRUCTION: This bike reflector is made of high-quality materials that can withstand outdoor conditions and regular use. It is waterproof, dustproof and UV resistant to ensure its longevity and effectiveness. 5. MULTIFUNCTIONAL FUNCTION: In addition to serving as a reflector, this additional feature further improves visibility, especially in low light conditions or when riding in areas with limited street light illumination, so that vehicles behind you can clearly see your position. Precautions: 1. As we all know , the different computers display colors differently, the color of the actual item may vary slightly from the following images. 2. If you feel difficult to choose the size, you can feel free to contact mewe will give you some suggestion, but it is for you reference only. Shipment includes: 1/6 pair Bicycle Reflector