Feature: Features with Flame retardant. Soft sponge, no dust, high density. The 3D acoustically designed 2 inch foam helps break up sound waves and provide ideal moderate sound control on the wall or ceiling. The foam board is compressed by vacuum packaging. Just open the package and place it in a well-ventilated place for about 24 – 48 hours, or soak the foam in water for one minute, then wring out the water and use a hair dryer or let it air dry. And it will quickly return to its normal size. Sound-absorbing sponge with beautiful appearance and good acoustic characteristics, its greatest feature is: due to its shape, it provides little diffusion, it makes you sound more dynamic. Very suitable for live therapy sound on the walls of studios or offices-used in recording studios, control rooms, office home studios, home entertainment theaters, home offices. Easy to shape and cut, modification will not affect performance. Material:High Quality Foam; Color:Black; Dimension:30 x 30 x 5cm, 12 x 12 x 2inch; Quantity:12 Pcs/ Set; Weight:798g; Note: Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package Included: 12 x Acoustic Foams