Reduce noise: 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. Quickly unfold: 24 packs/sets. The soundproof foam is compressed by vacuum packaging and placed in a well-ventilated place. It can quickly return to normal size in about 24-72 hours. Flame Retardant & Environmentally Friendly-The sound insulation foam is flame retardant, preventing fire from spreading and reducing strength. The production material does not contain formaldehyde. It is also durable and the design is durable. Easy to install: The sound insulation foam panel is light in weight and can be installed on a of different surfaces. No special tools are required for installation. Note: Double tape/tape or glue is not included in the package, it needs to be purchased separately. Widely used: It is very suitable for live therapeutic sound on the walls of studios or offices, recording studios, control rooms, office home studios, home entertainment theaters, conference rooms, baby rooms, etc. Colour: black + white Material: polyurethane Size: 30x30x5cm Package Contents: 12 * Black sound-absorbing cotton 12 * White sound-absorbing cotton Only the above package content, other products are not included. Note: Light reflection 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.