19 Prefabricated soundproof cabins, not of metal; Soundproof booths, transportable, not of metal; soundproof meeting, telephone or video booths, not of metal; Non-metallic frames for glazed doors; non-metallic modular shelters; Archways made from non-metallic materials; space dividers (structures), not of metal; sound deadening gypsum wallboard; plastic reinforced wall panels for use as sound and light barriers; non-metallic noise barriers