SoundproofingAcoustic foam Triangular grooves structure for better noise absorption, helps to reduce and absorb unwanted echoes, waves, reverb and flutter echoes for better recording effect. Upgraded AccessoryAdditional 270pcs strong double-side adhesive tape is included for free, which helps you finish the installation better and protect your walls from damage. Can be removed easily.The size of our acoustic foam sound insulation is 30*30*2.5CM, and the color is black Quick RecoveryIf this high-density foam doesn't return to shape, please soak it in water for a few minutes and dry in the air to recover the shape in 24 to 48 hours. Wide ApplicationsSuitably used not only for spot treating sound on walls in your studio and office but also for use in recording studios, vocal booths, control rooms. Professional SafeWith strong fire resistance and good air permeability, the acoustic foam panels can stop burning to prevent hidden fire hazards. Also, non-toxic materials won't do harm to your body while everyday use.