Polyester Fiber Sound-Absorbing Board Wall Decoration Piano Room Wall Paste Felt Board Interior Sound Insulation Board Flame Retardant Customization. Drum rooms, piano rooms, instrument rehearsal rooms, recording studios, home theaters, KTV rooms, theaters, studios and live-streaming rooms. Open-plan offices, meeting rooms, training rooms, classrooms, libraries, lecture halls, exhibition halls and government lobbies. Hotel lobby, chain restaurant, coffee shop, gym, swimming pool, shopping mall, parent-child paradise. Equipment rooms, factory control rooms, acoustic laboratories, soundproof rooms, interrogation rooms and command centers. Home theater rooms, studies, children's rooms, villa basements and master bedrooms. High Sound Absorption: NRC 0.8-0.95, reduces reverberation & echoes, improves acoustic clarity. Eco-friendly & Flame Retardant: 100% polyester, formaldehyde-free, B1 fire rating. Customizable: 30+ stock colors, customizable size, thickness & shape. Easy Installation: Adhesive/keel/hanging mounting, fits most flat walls. Durable & Easy Maintenance: Moisture/mildew/impact resistant, wipeable, no deformation.