Decorative stone for interior walls only. Made of ciment. One carton of stone covers 8,21 sq. ft. including 3 different stone lengths: 7-1/2 in., 12 in. and 19 in. Superior quality, cement-based product. Durable, colourfast, non-flammable, maintenance free. Easy to install. Actual measurements: 4 in. high, 1 in. thick. Grey.