Acoustimac DMD-422 Acoustic Panel. – 48″x24″x2″ Covers 8 Sq. feet each. These panels are loaded with high performance 4lb Owens Mineral Wool Insulation. Each panel is made in the USA, using high grade cabinet plywood, and wrapped in our exclusive DMD Fabric. All Acoustimac Acoustic Panels are wrapped on front and sides in fabric, and a wood backing. Easy-Mount Hardware and screws for walls are included.NRC RATINGS:0.22 NRC @ 125 HZ 0.82 NRC @ 200 HZ 1.21 NRC @ 500 HZ 1.10 NRC @ 1000 HZ 1.05 NRC @ 2000 HZ 1.05 NRC @ 4000 HZOur sound absorbing panel wall packs are useful in many Practical applications, including:HOME ACOUSTICS Foyers, grand rooms, man caves, living rooms, home theatersSTUDIO ACOUSTICS professional recording studios, home studiosOFFICE ACOUSTICS Offices, Lobbies, Waiting Areas, Conference rooms, break roomsRESTAURANT ACOUSTICS diners, bistros, cafeterias and eateriesCHURCH ACOUSTICS churches, mosques, synagogues, temples, ashramsACOUSTIC TREATMENT FOR SCHOOLS AND GYMS classrooms, multi purpose rooms, libraries, offices, lunchrooms, gymnasiums