18 pcs. 30X30X4CM Sound Absorbing Foam Sound Absorbing TilesIn order to improve the opening steps and specific acoustic characteristics, make it not only has the ability to absorb sound effectively, without harm to the human body. Suitable for studio audio recording, listening room, home theater, KTV, and all kinds of for public places. Sponge is an excellent insulation sound, sound-absorbing thermal insulation materialSound-absorbing sponge is sponge-based for further processing, acoustic inside the sponge, and the reflection of the increase in number, to achieve noise, sound absorption effect. Material: FoamColor: BlackSize: 30x30cmThickness: 4cmPackage Contents:18 x FoamOnly the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement error is +/- 1-3cm.