You can rotate the bike rearview mirror at 360 degrees. It can be adjusted any direction to help you watch every direction of your back. While this bike mirror provides a wider vision of the road conditions behind you, it can help keep you safe from road accidents. It is made of plastic and acrylic material. There are multiple sizes to choose from. This product is suitable for bike. Item Name: Bike Rearview Mirror Material: Plastic, Acrylic Features: Widely Application, 360 Degree Rotatable, Impact Resistant Size Details: A, Diameter: 5cm/1.97" (Approx.) B, Diameter: 7.5cm/2.95" (Approx.) C, Diameter: 7.5cm/2.95" (Approx.) D, Diameter: 7.5cm/2.95" (Approx.) E, Diameter: 9.5cm/3.74" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Bike Rearview Mirror