Perfect sound absorption for large applications - Professional sound control, sound absorption and reverberation reduction. By attenuating excessive sound waves to achieve better recording effects, suitable for multiple occasions, not only for one-off processing of sound on your recording studio walls, but also for use in control rooms, home studios, theaters and offices. High quality flame retardant material High density polyurethane material. Made from flame retardant and environmentally friendly material, passed SGS environmental protection and flame retardant test, is a safe and reliable product. (NOTE: Do not worry about the product deformation caused by long-term compression. It can be soaked in water for a while, and then air dried to restore the original shape.) Classic corner surface design -12 groove corner surface increases the contact area with sound waves, and the sound absorption effect is better than other forms of surfaces. In addition, our soundproof foam panels are also a great idea for wall decoration due to their elegant Wedge surface. Size: 12 "x 12" x 2 "/ 30 x 30 x 5 cm; Quantity: 12 packs Easy to install You can choose to use stickers or aerosol acoustic foam to attach the foam boards. When using stickers, make sure the wall is flat and free from foreign objects such as powder, which will affect the effect of the paste. If your wall is rough, we recommend using aerosol acoustic foam. NOTE: Stickers and Acoustic Foam Spray Adhesive are not included.