Bison™ Tumbled Stone Tile, 5.9375" x 5.9375" x .375"; Matte, Tan color, Textured Surface. Antique look shows off your artwork in vintage fashion. Porous tiles must be sealed for water resistance. Tumbled Stone is 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.