Soft sponge dust-free; Sound effects suitable for studios and KTV etc; Product application principle: Use the open-pored structure to increase its sound absorption capacity and optimize its internal porosity reduce the interference and reverberation of indoor reflected sound improve the purity of the sound adjust the indoor sound field and reverberation and make the sound pleasant to the ears Material: sponge Size: 300x300x25mm Quantity: 12 pieces Color: black/blue/red/purple Applicable to: Home decoration wall widely used in recording studios recording studios audio-visual rooms audio-visual rooms piano rooms drum rooms anchor rooms home theaters KTV soundproof rooms conference halls studios broadcasting rooms theaters etc Interior decoration of the occasion Package Included: 12 x acoustic foam