Reduce Noise: The 2-inch foam acoustic panel is designed to reduce wave amplitude by increasing air resistance and absorbing sound. Effectively controls mid and high frequencies. Quick 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. Flame Retardant & Eco-Friendly: The sound insulation foam is flame retardant, preventing fire from spreading and reducing its intensity. The production material does not contain formaldehyde. It is also durable and designed to last, while cancelling echoes. Easy to Install: The soundproofing foam panel is lightweight and can be installed on a variety of surfaces. No tools are required for installation. Note: Double-sided tape/adhesive or glue is not included in the package and must be purchased separately. Widely Used: Suitable for live therapeutic sound on the walls of studios or offices, recording studios, control rooms, office home studios, home theaters, conference rooms, baby rooms, etc. Color: White Material: Polyurethane foam Size: 30 x 30 x 5cm Package Contents: 12 x Sound-absorbing foam Only 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 allowable measurement error is +/- 1-3 cm.