19 Non-metallic building materials, namely, soffits, fascia, floor boards; concrete; concrete building elements, namely, concrete building elements joined by metal connectors, namely, blocks, bricks, posts, slabs, panels; concrete blocks, panels and beams; concrete prefabrication, namely, concrete houses, buildings, walls; concrete pipes; storage tanks made of masonry, bricks or concrete; storage tanks of masonry, brick or concrete; accessories, parts and fittings, namely, non-metal clips for use in building and construction that are sold as a unit with the aforesaid goods