Materials, not of metal, for building and construction; floors, not of metal; ceramic tiles for walls, floors and ceilings; tiles not of metal, for building; swimming pools [structure], not of metal; paving slabs, not of metal; floating boards, not of metal; non-metallic building materials in the form of slabs; mosaic floor tiles; ceramic tiles for flooring and facing; building materials of artificial stone; stone veneers [building materials]; stair-treads [steps], not of metal; marble; grani...