Ek Onyx Black is a 47" x 110" Porcelain Slab. Porcelain is pressed and fired denser than ceramic, which is what lets it take water, frost and daily traffic. The polished face throws light back into the room, so it reads brighter than a matte tile of the same colour, and shows footmarks sooner. Porcelain of this density is normally specified for floors and walls through the home. Fewer grout lines let the floor read as one surface rather than a grid. A box covers 36.16 square feet, so order the area plus about ten percent for cuts and waste. Supplied by Sarana Tile.