Our product is made of high strength material, which is very durable. The rear view mirror is safety and visible while you riding. 360 degree rotate help you watch every direction of you back. Sometimes treat it as a mirror to check your face or cloth. You are worth it. Please allow 1-3cm error due to manual measurement. Thanks for your understanding. Adjustable: This rearview mirror features a 360 ° adjustable support bar, which can be adjusted to any angle according to your needs, the rotating convex mirror provides clear images of the road conditions behind you. HD Convex Mirror: The bike mirrors for handlebars with convex mirror designs for a more wide field vision,which provides you HD visuals of the road conditions behind you to help keep you safe from road accidents. Material: Plastic + Glass Color: Black Size: Approx. 13 x 5.5 x 2cm / 5.12 x 2.17 x 0.79in Quantity: 1pc Weight: Approx. 38g Package list: 1 x Bicycle Handlebar Rearview Mirror High Quality This mirror for bike provides wide and undistorted view.Made of shatterproof convex mirror and high-strength ABS material. Shockproof and Anti-break,climate resistant,long lifespan,easy to clean. Hassle-free Installation Tool-free assembly. Simply insert the expanding plug into the handlebar bar end, tighten the thumb, and adjust the mirror to desired view position. Universal Use Approx. 13 x 5.5 x 2cm / 5.12 x 2.17 x 0.79in, Ideal for road bike, mountain bike, motorcycle, electric bike, etc.