Acoustic foam treatment sound proofing Absorbing cotton insulationFeatures -High density acoustic foam cell structure-Helps to flutter echoes and reduce excess reflections and reverberation-Improves vocal clarity and acoustics of your room-Ideal for use in recording studios and home theatres-Highly fire retardant-Can be easily attached with staples， nails， screws， tacks， glue or velcro-Classic wedges design looks great and provides varying thickness to balance absorption and reflection-Acoustic foam meets the criteria for a Class B rating-Widely used in recording studio， Drum room， studio， piano practice room， KTV hall， cinema， etcSpecifications Material: cottonSize:500*500*30mmColor: grayPackage included1x Acoustic foam