Porcelain slabs; porcelain tiles; porcelain and ceramic wall tiles; porcelain and ceramic floor tiles; porcelain and ceramic ceiling tiles; clay roofing tiles; non-metal building materials, namely, clay slabs, concrete, concrete blocks, concrete flooring, concrete slabs, ceramic blocks, ceramic flooring, ceramic slabs; non-metal tiles for walls, floors or ceilings; paving tiles; mosaic tiles for covering walls and floors made of ceramic or stoneware, ceramic tiles for covering walls and floors