Safety Sport Mirror The mirror is made of flat glass for an undistorted view of traffic behind the cyclist. Made in USA Mounts firmly because of the way the hollow rubber mounting block grips eyeglass bows Mounts on most wraparound sunglasses Mounts on fine wire bows, as long as they have a hinge long enough for the  long hollow rubber block to grip Mounting arm can be bent by the user for a custom fit (Instructions are printed on the display card.) Comes apart if dropped or stepped on, due to being encased in a rubber mounting connected to an adjustment arm by a ball and socket assembly