Bison™ Tumbled Stone Tile, 3.9375" x 3.9375" x .375"; Matte, Tan color, Textured Surface. Very porous tiles must be sealed if used in showers or backsplashes. A compressed sandstone product.Production for this tile requires the use of a green rubber pad, 1/8" thick and at least an inch larger than the tile. Sold separately:1/8" Green Heat Conductive Rubber Pad or a 1/8" thick Nomex Pad.