Owens Corning 703 Rigid Fiberglass Board, 4 Inch (3PK)
Buy Owens Corning 703 4 Inch Fiberglass Insulation
Owens Corning R-8.7, 2-in x 2-ft x 4-ft 703 Series Unfaced Fiberglass Board Insulation with Sound Barrier in the Board Insulation department at Lowes.com
Looking for a material for acoustic panels : r/Acoustics