Penta Mosaics NatureGlass Smooth Grey belongs to Centura's Penta Mosaics range and measures 12" x 12". Floor and wall use are both covered, useful where a feature wall and the floor beneath it need to match exactly. One box contains 5 pieces, enough for 5.2 sq ft, or 1.04 sq ft a piece. Mosaic sheets are mounted on mesh, so the pattern stays aligned while it is set and the sheet can be cut to fit an edge.