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: 24/36/54PCS x Soundproofing Foam Specifications: Material: Polyurethane foam Size:25*25*2.5 cm/10*10*1" Color: Black, Purple, Red, Blue Quantity: 18pcs 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.