Designed to treat the acoustic irregularities of studios, schools, houses of worship, nightclubs, and more, this Studiofoam Pro Panel from Auralex is slim in construction and fashioned out of melamine-free material. Each panel carries a Class-A fire rating and an NRC rating of 0.90, despite being only 1.5" thick. Intended to be mounted on the wall, each charcoal-gray panel measures 2 x 4', sports a beveled edge, and is protected against rot, crumbling, and the sorts of surface-harm usually ascribed to Class A fire-rated materials.