Lucas’s shield glue-up Styrofoam ceiling tile 20 in x 20 in – #R124. Goes over popcorn and most ceiling surfaces. Made of light weight extruded polystyrene which make it very easy to install. Sold in a case of 8 tiles covers 21.6 sq.ft and each tile is 1.6 ft x 1.6 ft. Paintable with most water based paints using roller, brush or sprayer.