Perceptions ceiling tile from A La Maison Ceilings collection offers a modern design. 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 5/16 in. these tiles will add beauty, sound dampening and insulation.