non-metallic planks; non-metallic spars being struts for use in building; non-metallic flooring made from laminates, thermoplastic resins, thermosetting resins, carbon and plastics; prefabricated non-metal structures in the nature of bridges and bridge units, comprised of blocks, sheets, panels and boards; non-metallic building materials being columns, and/or structures for buildings, roofs, bridges, residential use, office buildings; fire retardant floor, wall, roof and door panels not of me...