Non-metallic building materials, namely, marble, stone, ceramic tiles and marble tiles which, through a specific industrial process are made to look used and antique; tiles made in marble; dress marble tiles; mosaic art tiles made of marble, stone and ceramic; marble, stone and ceramic tiles made with a specific concave shape; marble, stone and ceramic tiles made with the surface engraved with parallel lines, all for outdoor and indoor flooring and for tiling building walls; non-metallic rigi...