Note: 1.The product is compressed and shipped and it will be a little deformed when it is received. The thickness and length will be different. 2.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: 12/24/36/48/96pcs x Soundproofing Foam Specifications: Material: Polyurethane foam Size:25x25x2.5 cm/10x10x1 inch Color: Black Purple 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 room.