3D ACOUSTIC DESIGN: Our 2 inches foam provides moderate sound control on walls or ceilings. Perfect for individuals to reduce and absorb unwanted echoes, waves, reverb and flutter echoes. ENVIRONMENTAL PROTECTION: Made up of environmentally friendly polyurethane foam at 50/lbs per cubic , the acoustic panels not only have effective sound absorption characteristics, but also will not cause any harm to our body. QUICKLY RECOVER TO NORMAL SIZE: Open the Vacuum package, put the foam panels in a ventilated place about 24-48 hours. Another is soaking the foam in water for one minute then wring the foam out water, use air dry it or use a hair dryer. You can also let them simmer under the sun as well! WIDE USE: Great for spot treating sound on walls in your studio or office - For use in recording studios, control rooms, Offices home studios, home entertainment theaters, Home Offices. Easy to shape and cut to size, altering 't affect performance. size:30 x 30 x 5cm Material:Polyurethane colour:blue Package Contents: 12 x Mushroom soundproofing foam Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.