Multi Classic 12X24 Gauged Slate Tiles are available in a wide variety of multicolor shades including rusts, grays, creams, blacks and reds.It is recommended for exterior use in non-freezing climates and indoor project applications including flooring, backsplashes and walls.This ...Multi Classic 12X24 Gauged Slate Tiles are available in a wide variety of multicolor shades including rusts, grays, creams, blacks and reds.It is recommended for exterior use in non-freezing climates and indoor project applications including flooring, backsplashes and walls.This product has a Natural cleft surface and due to the clefts on the surface it will not have an even thickness. This is perfectly normal for this product and that is what is the beauty of this tile. The back of this tile is gauged to enable installers to make the work easy while installing.