Reduce Noise: 2-inch foam designed acoustic panels reduce wave amplitude by increasing resistance and sound absorption. Can effectively control mid-range and high frequencies. Quick expansion: 12 packs/set. The soundproofing foam is compressed by vacuum packaging and placed in a ventilated place. It can quickly return to normal size within about 24-72 hours. FIRE RETARDANT AND ECO-FRIENDLY - Acoustic foam is flame retardant, preventing fire from spreading and reducing strength. Production materials do not contain formaldehyde. It is also durable and has a durable design. and eliminate echo. Easy to install: Acoustic foam panels are lightweight and can be installed on a variety of different surfaces. No special requirements are required for installation. NOTE: Double tape/tape or glue is not included in the package and needs to be purchased separately. VERSATILE USES: Perfect for live therapy sound on the walls of studios or offices, recording studios, control rooms, offices, home studios, home entertainment theaters, conference rooms, nurseries, and more. color: White Material: Polyurethane foam Dimensions: 30 x 30 x 5cm Package Contents: 12 x Acoustic Foam Only the above package contents, other products are not included. NOTE: Due to lighting and different monitors, the color of the item may vary slightly from the actual item. The measurement allowance is +/-1-3cm.