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 yard . 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 method 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 won’t affect performance.AFTER SERVICE WARRANTY: Our US based customer service means that you can trust that if you’re not satisfied for any reason . you can get a hassle-free refund or replacement.