Reduce noise: The 2-inch foam-designed acoustic panel reduces wave amplitude by increasing resistance and absorbing sound. Effectively controls mid and high frequencies. Quickly unfolds: 12 pieces per set. The soundproof foam is vacuum-compressed and, when placed in a well-ventilated area, returns to full size within 24–72 hours. Flame retardant and environmentally friendly: The sound insulation foam is flame retardant, helping prevent the spread of fire. Made without formaldehyde. Durable material and design. Helps reduce echoes. Easy to install: Lightweight sound insulation foam panels can be installed on various surfaces. No special tools required. Note: Double-sided tape or glue is not included and must be purchased separately. Wide application: Suitable for use in studios, offices, recording studios, control rooms, home studios, home theaters, conference rooms, nurseries, and similar spaces. Color: White Material: Polyurethane foam Size: 30 x 30 x 5 cm Package contents: 12 x Sound-absorbing foam panels Note: The package includes only the items listed above. Other products are not included. Note: Lighting and display differences may cause slight color variations between the image and the actual item. Measurement error allowance is +/- 1–3 cm.