Features: High-quality foam panels, dimension is 30 * 30 * 2.5cm/ 12 * 12 * 1in, pack of 12pcs or 24pcs for option, and 3 colors(dark grey/light grey/red) for choices. Help to reduce reverb, flutter echoes, undesirable reflections and unwanted noises to create an excellent listening or recording environment for you. Suitable for using in small and medium-sized rooms, such as recording studios, control rooms, home studios, home entertainment theaters, home offices, games rooms, etc. Adopts high density, eco-friendly and fire-proof material, each piece of foam panel has 11 slots, better sound absorption performance and better audio recording quality. Note: The foams may be a little deformed caused by compression packaging, you can put them in a ventilated place for 24H or soak the foam in water for 1min, then drying the foam by natural wind or a hair dryer. Specifications: Color: Dark Grey/ Light Grey/ Red(optional) Quantity: 12pcs/ 24pcs(optional) Item Size: 30 * 30 * 2.5cm/ 12 * 12 * 1in Packing List: 12 * Pieces of Foams