Our acoustic wall tiles are designed to trap and deflect sound energy. They are made of open cell polyester foam that's flame retardant in accordance with UL 94 HF-1 flammability testing. The design is very pleasing to the eye while offering outstanding sound absorption qualities making them the perfect solution for rehearsal studios, auditoriums, home theaters, broadcast booths, and more. Practical one square foot tile size can be easily installed in any size room with spray adhesive, double sided tape, contact cement, or glue/caulk. Grey charcoal colour. Price is per tile.