This rectangular sound-absorbing wall panel is made of felt. They improve sound quality by absorbing unwanted noise, echo and reverberation from walls and ceilings, providing a crystal-clear audio experience. Perfect sound absorption improves sound quality, making it ideal for recording studios, home studios and home theater professionals. Pack of 12 square acoustic panels measuring 40x30x0.9 cm, with flat, even bevel cuts for easy installation. It can be cut to fit any size or shape of wall or door. Suitable for a variety of settings including offices, home offices and TV rooms, these acoustic panels reduce the transmission of noise through walls and block out room noise. Warm reminder: It does not come with adhesive, you need to bring your own glue.