Certification : NONESize : 250x250x50mmModel Number : 12Pcsis_customized : YesMaterial : SpongeDensity : 12kg/m^3Note: Because of the large size of the product, we use compressed packaging for delivery. This may cause the product to deform. If you find that the product is deformed when you receive it, you can wash it with water and then dry it. It will quickly restore the perfect shape. In addition, this type of ordinary density sound insulation cotton. Please read carefully before placing an order. Thank you for your understanding and support.Features:-Soft sponge, no dust;-The sound effects, suitable for studio and KTV etc;-Square sound-absorbing sponge with beautiful appearance and good acoustic characteristics, its greatest feature is: due to its square shape, it provides little diffusion, it makes you sound more dynamic. It may, for example BASSTRAP combined together with the other products, consisting of a wide absorber, the effect is very good.Specifications:Material: SpongeSize: 250x250x50mmQuantity:12PcsColor: BlackWeight: About 275gApplied to: Studio, Piano room, Drum room, Anchor's room, Home Theater, KTV, Meeting rooms, Instrument rooms, etc.Package Included:12 x Soundproof foams