These actually Are beveled glass With sticky tape on the back. The measurements are very precise, and it was very easy to use. We used it as a mirror surround, and it turned out very nicely. Be sure to plan ahead and clean your mirror with denatured alcohol very well so it will stick once it is on. We couldn't get it off without breaking the glass. It's a nice addition to a plain flat mirror.The price was good, considering that it is glass and has good adhesive plus is Beveled, and the size is very accurate. We had a few pieces left over, but it saved a lot of money over buying a new mirror for the location. We didn't have to remove The old mirror that was heavily glued to the wall.