Certification : NONESize : 12x12x24cm/15x15x15cmModel Number : 4PCSis_customized : YesMaterial : spongeDensity : highNOTE: Dear buyer,Because of the large volume and quantity of this product, we ship it in compressed packaging. Compression packaging may cause you to find that the product becomes thin and wrinkled when you receive it. Please do not misunderstand that our products have quality problems. This is a normal phenomenon caused by compression. Just leave it in the air for a few days, or wash it with water and dry it, and it will quickly restore its original shape. Thank you for your understanding. If you have any questions about the product, please send us a message first. We are always there to ensure the best service.Features:Highly fire retardantMade from High Quality FoamSound-Absorption FoamHigh density acoustic foam cell structure for maximum noise absorptionHelps to flutter echoes and reduce excess reflections and reverberationImproves vocal clarity and acoustics of your roomMaterial: FoamColor: BlackDimension:12cm*12cm*24cm/15cm*15cm*15cmApplied to: Recording studios, Karaoke room,Piano room, Drum room, Anchor's room,Home Theater, KTV, Meeting rooms, Instrument rooms, etc.Package Included:3x Bass Trap Wall Foam1x Cube Foam