17
Rubber, gutta-percha, gum, asbestos, mica and goods made from these materials and not included in other classes; plastics in extruded form for use in manufacture; packing, stopping and insulating materials; flexible pipes, not of metal.
audio and acoustic products for sound insulation, security, and privacy, namely, architectural sound barriers, absorbers, and diffusers, acoustic membranes, acoustic separation units, nonstructural, nonmetal building materials for acoustical or sound insulation purposes, namely, ceiling tiles, acoustical curtains, acoustical liners, wall partitions and wall panels; audio and acoustic products for sound insulation, security, and privacy, namely, structural sound barriers, sound absorbers and diffusers