size:30 x 30 x 5cm Material: Sponge colour: white Package Contents: 5 x Sound insulation cotton Only the above package content, other are not included. Note: Light reflection 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. 3D ACOUSTIC DESIGN: Our 2 inches soundproof wall panels provide moderate sound control on walls or ceilings. Perfect for individuals to reduce and absorb unwanted echoes, waves, reverb and flutter echoes. : Made up of environmentally friendly polyurethane sound foam padding at 50/lbs per cubic yard, the sound dampening panels not only have effective sound absorption characteristics, but also will not cause any harm to our body. 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. QUICKLY RECOVER TO NORMAL SIZE: Open the Vacuum package, put the sound absorbing panel in a ventilated place for about 24-48 hours. Another is soaking the soundproof foam in water for one minute, then wring the acoustic panels out of the water, using air to dry it or using a hair dryer. You can also let them simmer under the sun as well!