[ sound insulation]: Made of high-density polyester fiber cotton, 300 pounds per yard, better sound insulation than sound insulation foam! Sound insulation, retardant, non-, anti-corrosion, and anti-fading. [Fashion]: The panel design doubles as the decorative wall art of your favorite space, allowing you to leave countless beautiful memories in a comfortable environment. [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 in the position. [Wide application]: suitable for on-site treatment sound of studio or office-used in recording studio, control room, office home studio, home entertainment theater. Easy to shape and cut, modification will not affect performance. Or use it on the ceiling, behind the TV or under ! [HIGH DENSITY AND -FRIENDLY]: Made with Polyester Fiber, Retardant, it is both safe to in and Contact, making it great for any location in the home or studio, it's safe for adults, kids, and pets! colour: silver-gray Material: polyester fiber cotton size: 30x30x0.9cm Package Contents: 12 x Sound absorbing panel Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.