This is a soundproofing board, which are made of good material, durable for use. Sound absorbing material reduces the reflection of the sound produced in the room and attenuates the sound. Suitable for home, school, gym, church, restaurant, office, etc. Features -Color:Grey -Material: Polyurethane -Size:30.00X30.00X2.50cm/11.79X11.79X0.98in -Suitable for your professional or office, home or recording studios, vocal booths, control rooms, etc. -It is manufactured with professional technology to ensure the high class of the product and can work for a long time. -It helps to create a quiet environment for small and medium-sized rooms. -They provide professional results for anyone looking to more accurately control the sound environment of a room. -It is most suitable for occasions where absolute sound insulation is not required, but moderate sound insulation is required. Package list: 18 x dumboards