Topkapi palace ceiling tile from A La Maison Ceilings collection portraits an octagonal shape surrounded with curved lacing. It can be glued over most stable ceiling surfaces including popcorn ceilings and painted to your likeness. The tiles are made from extruded polystyrene. The size is 19-5/8 in. x 19-5/8 in. coverage is 21.6 sq. Ft. Per pack. Depth of the design is 3/16 in. these tiles will add beauty, sound dampening and insulation.