If you are mixing a recording , you have to reduce ambient sound. This sound insulation board is denser, thicker, and more uniform, which produces more sound absorption effects, making them perfect for recording. Features - Color: Grey. - Material: Rubber cotton. - Size: About 30.00X30.00X4.00cm/11.79X11.79X1.57inch. - Made of rubber cotton material, light and durable, you can use it with confidence. - The sound insulation board is suitable for recording studios, practice rooms, piano rooms, home theaters and other places. - It is very suitable for dealing with sounds on the walls of your or office on-site. - It can absorb the energy of a large amount of incident sound waves and play a role in the attenuation of sound waves. - The workmanship of this product is perfect, and you will have a good experience in using it. Package list: 6 x Soundproof Panels