Usage Tips:[PROFESSIONAL SOUNDPROOF PROPERTIES]: The sound insulation board has a multi-fiber structure, and the sound is reflected countless times inside, reducing the intensity of the sound wave, thereby reducing the sound.The 2-inch foam-designed acoustic panel reduces the wave amplitude by increasing air resistance and absorbing sound. Can effectively control the intermediate frequency and high frequency. [JUST THE RIGHT SIZE]: These acoustic foam panels come with 24 pack in the package, each tile is 1 square foot of 2-inch thick acoustic wedge.Through professional noise reduction and noise reduction, the sound control panel can absorb bad noises well, and useful sounds are clearer. The sound insulation foam is flame-retardant and prevents the spread of fire. Ensure your safety. [HIGH-QUALITY ENVIRONMENTALLY FRIENDLY MATERIALS]: This soundproof wall panel is made of high-density polyurethane foam, 50/lb per cubic yard. The thickness is 2 inches (approximately 5.1 cm), which is 25% higher than similar products in density. It can provide moderate sound control on the wall or ceiling. [WIDELY USAGE]: Acoustic panels can help vocal lovers to obtain better recording effects, and can also make the living room and bedroom more quiet, very suitable for recording studios, vocal studios, home theaters, etc. [INSTALLATION INSTRUCTIONS]: Don't worry about product deformation caused by long-term compression. It can be placed for a period of time to return to normal, or soaked in water, and then air-dried to restore the appearance, just easily attach it with staples, nails, screws, tacks or glue.Note: Double tape/tape or glue is not included in the package, it needs to be purchased separately. Colour:grey+purple Material:Polyurethane foam Size:30 x 30 x 5cm Package Contents: 12 x Grey sound-absorbing cotton 12 x Purple sound-absorbing cotton Only the above package content, other products are not included. Not