These acoustical wallcoverings are designed and tested for sound absorption, using a rating known as the Noise Reduction Coefficient (NRC). This special rating specifies the amount of sound that is absorbed into a wall. The higher the NCR number, the more noise a wallcovering can absorb. They are manufactured with recycled polyester and olefin fibers. Common Applications: auitoriums, corridors, elevator lobbies, meeting rooms, recording studios, offices and theaters.