Nature split slate tiles(Mushroom tiles), also called Rock surface wall tiles ,standard size of our mushroom slate brick 300*150mm , the standard diemesion of our mushroom slate tiles, brick: 4 edges ,bottom sawn cut ; top surface with nature split (Riven)finsihed. the material can be slate and quartize or sandstone. the regular speices of our mushroom salte brick as below, for more contact our sales team for detail.