[ sound-absorbing performance] Sound insulation foam panels have been installed to reduce noise pollution. They can effectively reduce reverberation, floating , undesirable sound reflections and unnecessary noise. The sound insulation foam panel is used to control the reverberation sound, which is completely different from the sound insulation effect. [High-density flame-retardant material]-The soundproof wall panel is made of high-density polyurethane foam, 50 or lb per cubic yard. It is 2 inches thick, which is 25 percent more dense than similar products, and the material is made without formaldehyde, which makes it safe. The soundproof foam is flame retardant to prevent the fire from spreading and keep it safe. [Compressed packaging] The soundproof foam is compressed by vacuum packaging, and you need to place it in a well-ventilated place for about 24-72 hours. If you leave the product for 24-72 hours before installation and still cannot fully expand, please make to soak in water for 2-3 minutes, Will be able to expand to normal size. [Easy to install] The sound-proof foam can be used as an acoustic cover for walls, ceilings and doors. You only need to easily cut double-sided tape(not include). A wedge-shaped mat requires five pieces of tape to install the sound-absorbing foam tiles on the wall. Each tile is 0.67 square feet and 1 inch thick acoustic wedge heel. [Wide use] Very suitable for on-site sound processing on the walls of recording studios or offices, recording studios, control rooms, office home studios, home entertainment theaters, conference rooms, baby rooms, etc. colour: black Material: polyurethane Size: 30x30x5cm Package Contents: 24 x Soundproofing Foam 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.