Usage Tips:soundproofing : Acoustic foam panels can effectively reduce and absorb unwanted , waves, reverb and flutter , making the sound clearer when recording music. At the same time, it helps block and reduce noise so that you will not disturb others and will not be by others. It is the for recording studios, home theaters, conference rooms, etc. Self-Adhesive Design: Sound proof foam panels for walls uses a self-adhesive backing, easy to install, just peel off the kraft paper on the back and stick them . 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. Safe Material: Acoustic panels are made of polyurethane for better sound insulation than other soundproofing foam fillings! Odorless, non- and flame retardant. Children and the elderly can also use it with confidence. color:Silver Gray Material: polyurethane Package Contents: 12 x Acoustic foam(A) 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.