Sportsrain Flat Bicycle Helmet Mirror Extremely Lightweight Undistorted Rear View Rotate 360 Wide Angle for City Bike, Mountain Bike -Screw Installation Extremely Lightweight: Clear view, undistorted. The mirror is made of plating ABS, only weight 0.7ounce, extremely light weight, rear view. Easy to Install: Include a Screw in the package. Very easy to install. Rotated 360 Degree: Special design that can rotate 360. Wide angle. No necessary to turn your head. View Clear: Provides full undistorted field of view around you with a mirror surface which is just 1.25 X 1.75 inches which means unlike bulky products your forward view is not obstructed! Dimensions: Mirror: 45mm*30mm; Length: 240mm. Weight: 100g (3.6ounce)