THIN METAL WALLS SIDES AND BOTTOM WITH LG 12 in GLASS THAT SLIDES IN FROM TOP. HAS 3 HOLES TO ALLOW NATURAL OR ARTIFICIAL LIGHT THROUGH.. TO EITHER HOLD PICTURES STANDARD OR PANORAMIC SIZE OR POSSIBLY A SIGN`.. LIGHT FROM BACK WILL ILLUMINATE IMAGES.. THERE ARE FEET IN THE BACK WITH SCREW HOLES OR TO STAND ALONE..  12in X 4in  ..REAL GLASS