Our bike side is ABS,firm and,safe and.Is very versatile and suitable for people who commutes to and from get-off work by bikes. Comfortable to Wear: Our bicycles rear view breathable strap,light weight,small size,easy and very comfortable to wear,and it only takes a few second to put on and takes off. Innovative Design: Unique fashionable wrist,designed for wearing,not need to place on the bike.Just put it on your arm to get a good-sense of rear visual field. Riding : This bicycles adopts flat design and has a wide field of view,and allows you to understand the surrounding while riding,you can see behind without turn your head. Adjustable: Rearview with wrist strap,360 degree retotation,you can easily get the viewing you want by rotating,convenient to use.The wrist strap is a strap,which can be easily adjusted in size.