Description This is a soundproofing block, which are made of high-class materials, durable and can be used for a long time. These sound insulation cotton are denser, thicker, and more uniform, which produces more sound absorption effects. Features -Color: Black -Material: Polyurethane -Size: 20.00X20.00X20.00cm/7.86X7.86X7.86inch -These sound insulation cottonare denser, thicker, and more uniform, which produces more sound absorption effects. - Sound absorbing material reduces the reflection of the sound produced in the room and attenuates the sound. - These soundproofing cotton can be used as soundproof panelsfor walls, ceilings and doors. - They help to create a quiet environment for small and medium-sized rooms. - Sound absorption and noise reduction, safe and environmentally friendly, very practical.Package list: 4 x Sound Absorption cotton