Reduce noise: The 2-inch foam-designed acoustic panel reduces wave amplitude by increasing resistance and absorbing sound. It can effectively control mid and high frequencies. Quickly unfold: 12 packs per set. 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 and reducing fire intensity. The material contains no formaldehyde. It is durable and designed to last, while also reducing echoes. Easy to install: The sound insulation foam panels are lightweight and can be installed on various surfaces. No special tools are required. Note: Double-sided tape, tape, or glue is not included and must be purchased separately. Widely used: 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: Other items not included. Lighting and display differences may cause slight color variations compared to the actual product. Measurement tolerance is +/- 1-3 cm.