Reduce noise: The 2-inch foam-designed acoustic panel reduces wave amplitude by increasing air resistance and absorbing sound. Effectively controls mid-range and high frequencies. Quickly unfolds: Set of 12 panels. The soundproof foam is vacuum-compressed and should be placed in a well-ventilated area. It will fully expand within 24 to 72 hours. Fire retardant & environmentally friendly: The sound insulation foam is fire retardant, helping prevent the spread of flames. Made without formaldehyde. Durable material with long-lasting design. Helps reduce echoes. Easy to install: Lightweight sound insulation foam panels can be installed on various surfaces. No tools required. Note: Double-sided tape or adhesive not included and must be purchased separately. Wide application: Suitable for use on walls in studios, offices, recording studios, control rooms, home studios, home theaters, conference rooms, nurseries, and more. Color: White Material: Polyurethane foam Size: 30 x 30 x 5 cm Package contents: 12 x Sound-absorbing foam panels Note: Lighting and display differences may cause slight color variations between the image and the actual item. Measurement allowance is +/- 1-3 cm.