Note: The product is compressed and shipped, and it will be a little deformed when it is received. The thickness and length will be different. After receiving the sound-absorbing cotton, open the sound-absorbing cotton, sprinkle water on the sound-absorbing cotton, and restore it after drying it flat. Packaged included: 12PCS x Soundproofing Foam. Specifications: Material:Polyurethane foam; Size:25*25*2.5 cm; Color:Black,White,Gray, Red, Blue; Quantity:12pcs; Application: Family noise control (walls, pipes, ceilings, etc.); Workplace noise control (light walls, partitions, conference rooms, etc.); Entertainment noise control (KTV rooms, walls, ceilings, floors, etc.); Industrial noise control (factory walls, roofs, equipment, doors, control room, etc.); Features: -Deformation rebound rate, long service life. -Waterproof, anti- moisture, good air permeability. -Anywhere to help block sound and prevent echoes inside the room. -Pyramid sound-absorbing sponge with beautiful appearance and good acoustic characteristics, its greatest feature is: due to its pyramid shape, it provides little diffusion, it makes you sound more dynamic. It may, for example BASSTRAP combined together with the other products, consisting of a wide band absorber, the effect is very good