This product has a 3 inch convex glass mirror with an aluminized reflective backing. This brings up the dilemma of the handlebar mirror. It is nice to have your mirror attached to your bike. You never leave home without it. The problem is that you get a very narrow field of view using a reasonably sized flat mirror at arms length. In order to have the same angle of view as all of our other mirrors, as well as the inside mirror of your car your handlebar mirror would need to be 9 1/2 inches in diameter.
We get the correct angle of view by making the Bar End Mirror convex.