Reduce noise: The 2-inch foam-designed acoustic panel reduces wave amplitude by increasing resistance and absorbing sound. Effectively controls mid-range and high frequencies. Quickly unfolds: 12 panels per set. The soundproof foam is vacuum-compressed and will expand to full size within 24–72 hours when placed in a well-ventilated area. Flame retardant and environmentally friendly: The sound insulation foam is flame resistant, helping prevent the spread of fire. Made without formaldehyde. Durable design resists wear and 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 adhesive is not included and must be purchased separately. Widely used: Ideal for improving acoustics 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 between image and actual item. Measurement tolerance: ±1–3 cm.