Descriptions: Produced by environmentally polyurethane foam.In order to improve the opening steps and specific acoustic characteristics, make it not only has the sound absorption characteristics effectively, without any harm to human body Specifications: Material:Environmentally polyurethane foam Color:Black/ Red (As Pictures Show) Dimensions:12*12*24cm(4.72*4.72*9.43 inch) Features: -Suitable for sound recording studio, listening room, home theater, KTV, and all kinds of public places. -The sponge is the ideal sound insulation, sound-absorbing, heat insulation material -Sound-absorbing sponge is on the basis of sponge for further processing, acoustic inside the sponge and reflection of the increase in the number so as to achieve the noise, sound-absorbing effect. Package Contents: 4pcs(2pcs Red + 2pcs Black) Foam Panel