Soundproofing : Acoustic foam panels can effectively reduce and absorb unwanted echo, wave, reverb and flutter echo during recording to achieve better recording effect. It is the best choice for recording studios, home theaters, conference rooms, etc. Self-Adhesive Design: Sound proof foam panels for walls uses a durable self-adhesive backing, easy to install, just peel off the kraft paper on the back and stick them on the wall. No tools and extra glue required. (Note: When taking it off, please use a hair dryer to heat it before peeling it off, so there will be no residue). Widely Used: Sound proof panels is widely used for acoustic treatment in various spaces, and is very suitable for homes, recording studios, singing rooms, home theaters, home studios, conference rooms, etc. Acoustic panels are made of high-density polyurethane for better sound insulation than other soundproofing foam fillings! Odorless, non-toxic and flame retardant. Children and the elderly can also use it with confidence. With adhesive backing size: 30 x 30 x 1cm Material: polyurethane colour: A-White / B-silver gray / C-Black Package Contents: 12 x soundproofing panels Only the above package content, other products 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.