Reduce noise: The 2-inch foam-designed acoustic panel decreases sound wave amplitude by increasing air resistance and absorbing sound. It effectively controls mid-range and high frequencies. Quickly unfold: 12 packs/sets. The soundproof foam is vacuum-packed and should be placed in a well-ventilated area. It can regain its normal size in approximately 24-72 hours. Fire-resistant & Environmentally Friendly: The sound insulation foam is fire-retardant, preventing the spread of flames and reducing strength. The material used in production is free from formaldehyde. It is also durable and designed to minimize echoes. Easy to install: The sound insulation foam panel is lightweight and can be applied to various surfaces. No tools are required for installation. Note: Double-sided tape or glue is not included in the package and must be purchased separately. Widely used: Ideal for therapeutic sound application on the walls of studios or offices, recording studios, control rooms, home studios, home theaters, conference rooms, nurseries, etc. Colour: White Material: Polyurethane foam Size: 30 x 30 x 5 cm Package Contents: 12 x Sound-absorbing foam Only the above package content, other items are not included. Note: Lighting and different displays may cause the item��s color to vary slightly from the actual product. The allowable measurement error is +/- 1-3 cm.