SICIS NeoGlass Mosaics Color / Style: 219 Silk Cubes Tile Size: 7/8" x 7/8" Sheet Size: 12" x 12" x 1/4" Thick Supplied in face mounted sheets. The material is sold by the sheet which equals 1 square foot. This is because each sheet measures 12 inch by 12 inch. We recommend adding 10-15% to your quantity for waste resulting from cuts and shaping during installation to your space. If you need assistance calculating your quantity or space dimensions, please use the chat or call customer support.