[ Sound Absorbing Properties]- Acoustic foam panels are installed to reduce noise pollution. They effectively reduce reverb, flutter echoes, undesirable acoustic reflections, unwanted noises. Acoustic foam panels are used to control the reverberation sounds make and this is quite different from soundproofing.[Self-Adhesive and Easy to install]- The sound-proof foam panel has a self-adhesive tab covering the entire back that can easily stick to any surface. No special tools or materials are needed for installation. Easy to shape and cut to size, altering won't affect performance.[High-Density Flame-Retardant Material]- The soundproof wall panels made up of High-density polyurethane foam at 50/lbs per cubic yard. 2 inches thick,25% more dense than competing products and the material used in making them is formaldehyde-free, which makes it non-toxic.The sound-proof foam is fire retardant, stop fire from spreading Keep you safe.[Compress the Packaging]The sound-proof foam comes compressed in a vacuum package and you need to place in a well ventilated place for about 24-72 hours. If you leave the product for 24-72 hours before installing it,still can not fully expand, please be to soak in water for 2- 3minutes, 100% will be able to expand to the normal size.[Wide Use]- Great for spot treating sound on walls in your studio or office, Recording Studios, Control Rooms, Offices Home Studios, Home Entertainment Theaters, Home Offices, Meeting Room, Baby Room, etc.Colour:blackMaterial:PolyurethaneSize:30 x 30 x 5cmPackage Contents:24 x Acoustic Foam PanelsOnly 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.