Aquaria structures, namely, aquarium sand, aquarium gravel and decorative aquarium stones; agglomerated bagasses of cane in the nature of asbestos board for building purposes; alabaster; roof flashing, not of metal; angle irons, not of metal; lintels, not of metal; slate; roofing slates; clay, namely, clay flooring, clay sculptures and clay roofing tiles; grog fired refractory material, namely, refractory construction materials, not of metal; potters' clay; scaffolding, not of metal; reinforc...