Plexiglas literature or paper holders are custom made to any size or shape that you may require. They may be clear plexiglas for the insert, that essentially covers or protects the paper that you may insert. The border or frame is usually back sprayed to hide the mounting adhesive etc. This is mounted to a back plate that is spaced away from the front plate to allow the paper to be inserted. Some inserts are preferred to be held in semi permanently by a hex screw at the top edge. In this case a hex wrench is supplied so they can easily be maintained.