Thickness: ≈ 0.21" Easy to install (mounted with usual mastic adhesives), easy to cut Easy to clean with ordinary cleansers May be applied over popcorn ceilings Can be painted with emulsion, acrylic or other water-based paints The Royal Collection tiles are made out of extruded polystyrene (a type of styrofoam) which makes them even, thin, and offers a smooth surface, with great natural-looking designs. The unique surface allows the tiles to be able to be cleaned easily, to be water-resistant, and the design allows the customer to give the tiles the finish him/her desire, roller, sprayer, or regular paint brush....since these tiles can be painted with any water-based paint.