Made up of environmentally friendly foam of 24 packs with high density, not only have effective sound absorption characteristics but also will not cause any harm to our body. The 1 inch thickness of foam provides moderate sound control on walls or ceilings and is perfect for reducing and absorbing unwanted echoes, waves, reverb and flutter echoes. Easy to recover to the normal size by two ways: putting the foam panels in a ventilated place or soaking the foam in water for one minute then drying the foam via a hairdryer or under the sun as well. Comes with compact design and light weight, there are 3 colors for option and easy to shape and cut to size for various combinations without affecting performance. With high sound absorbing and fire-retardant ability, great for studios, recording studios, control rooms, home entertainment rooms, home theaters, office and more. Specifications: Color: Black Pack Quantity: 24pcMain Material: Foam Single Pack Size: 30 * 30 * 2.5cm / 11.8 * 11.8 * 0.98in Package Size: 35 * 35 * 10cm / 13.7 * 13.7 * 3.9in Package Weight: 720g / 25.2oz