Adam Hall Accessories 0160B - Acoustic Molton B1 black 500g/m3, 300 cm wideAcoustic molton impregnated in flame retardant and 500 g quality, for rehearsal room , studios and stages with excellent sound absorption coefficient. Specifications Product type : blackout cloth Type : Acoustic molton Material : 80% cotton 20% viscose, recycled Color : Black Width : 3 m Weighted sound absorption coefficient (ISO 11654) : w : 0,70 nature 0. 60 black SOUND Reduction Coefficient NRC (ASTM C423) : 0,65 nature 0,60 black Weight : 500 g m