[Excellent sound insulation]: 300 pounds per cubic yard, better sound insulation than sound insulation foam Sound insulation, flame retardant, odorless, non-slip, anti-corrosion, and anti-fading. Flame Retardant Rating: B1-Perform on-site sound processing on the walls of recording studios or offices, suitable for recording studios, control rooms, office home studios, home entertainment theaters, and home offices.[]: This unique hexagonal sound insulation board adopts a beveled edge design, which can not only absorb unnecessary echoes, but also play a role in wall surface decoration.[Easy installation]: Both general spray adhesive and double-sided tape can be used. Just stick spray adhesive or double-sided tape (not included) on the back of each panel and stick it in the desired position.[Wide application]: Very suitable for on-site treatment sound on the wall of studio or office-used in recording studio, control room, office home studio, home entertainment theater, home office. Easy to shape and cut, modification will not affect performance. Or use it on the ceiling, behind the TV or under the carpet [Improve acoustic quality]: These sound insulation panels are multifunctional and can be used in studios, rehearsal rooms, concert , podcasts, churches, home theaters, vocal kiosks, home studios, offices, private spaces for men, and kennels , Sundries wardrobe, etc. By using the absorption panel to eliminate unnecessary sounds, other sounds can be made clearer.colour:BlackMaterial:Polyester cottonsize:Side length about: 17.5cmPackage Contents:12 x Acoustic PanelsOnly 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.