Reduce Noise: The 2-inch foam acoustic panel reduces wave amplitude by increasing resistance and absorbing sound. Effectively controls mid and high frequencies. Quickly Unfold: 12 pack/set. The soundproof foam is compressed through vacuum packaging and placed in a ventilated place. It can quickly return to normal size in about 24-72 hours. Fire Retardant & Eco-Friendly: The sound insulation foam is fire retardant, preventing fire from spreading and reducing its intensity. The production material does not contain formaldehyde. It is also durable and designed to last. And cancels echoes. Easy to Install: The sound insulation foam board is lightweight and can be installed on a variety of surfaces. No special tools are required for installation. Note: Double-sided tape/tape or glue is not included in the package and must be purchased separately. Widely Used: It is very suitable for live therapy sounds on the walls of studios or offices, recording studios, control rooms, office home studios, home theaters, conference rooms, children's rooms, etc. Color: White Material: Polyurethane foam Size: 30 x 30 x 5cm Package Contents: 12 x Sound-absorbing foam Note: Light and different displays may cause the color of the item in the picture to be slightly different from the real thing. The allowed measurement error is +/- 1-3 cm.