It's suitable for all kinds of helmet, perfect for adults and kids. Once locked, the mirror stays in position so you never have to worry about it vibrating during your rides. Mounts on both left side & right side with ease. Bike helmet mirror is used as a rearview mirror mounted on a riding helmet to improve safety during driving, provide you a funny and safe cycling. Bike mirror is durable no need worry about mirror breaking. Super clear mirror will bring you wide vision when cycling. Just tear down the white paper from the Nylon Buckle and stick it on your helmet. Stick on both left side and right side then adjust the mirror for suitable view. Colour: Black Material: Aluminum+ABS Package Contents: 2 x Bike Helmet Mirror Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. Note: 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. Sold by-DIMEANI official store