[Professional Sound Absorption Performance]- Sound insulation foam panels have been installed to reduce noise pollution. They effectively reduce reverberation, flapping echoes, undesirable acoustic reflections and unwanted noise. Soundproofing foam panels are used to control the reverberant sound, which is completely different from soundproofing.[Easy to Install]Acoustic foam can be used as acoustic cover for walls, ceilings and doors, just cut 3cm of double-sided tape , one wedge pad needs five pieces of tape to install the sound-absorbing foam tiles . 0.67 square feet per tile, 1inch thick acoustic wedge.[High Density Retardant Material] - The sound insulation wall panel is made of high density polyurethane foam, 50/lbs per yard. It is 2 inches thick (about 5.1 cm), 25% denser than similar products, and the production material does not contain formaldehyde, which makes it non-toxic. Soundproofing foam is retardant, preventing fire from spreading and keeping you safe.[Compression Packing] Acoustic foam is vacuum packed and compressed, you need to place it in a well ventilated area for about 24-72 hours. If you leave the product 24-72 hours installation and still can't fully expand, make to in water for 2-3 minutes, 100% will be to expand to normal size.[Wide range of uses]- perfect for 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:greyMaterial:PolyurethaneSize:30 x 30 x 5cmPackage Contents:48 x Soundproofing FoamOnly the above package content, other products are not included.Note: Light 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.