ATS Acoustics Rigid Fiberglass Board, 2 inch, Case of 6 This is ATS Acoustics brand 3-pound rigid fiberglass acoustical board in a case of 6 24 x 48 x 2 inch pieces. This rigid fiberglass material is an exact substitute for Owens Corning 703. Sound absorption, density, appearance, and physical properties are virtually identical to the Owens Corning 703 Product dimensions are 24" x 48" x 2" 6 pieces included