How to recover the normal size of the acoustic foam: 1. After opening the vacuum package, place the acoustic foam in a ventilated place for 12 to 24 hours; 2. Or soak the foam in the for 1 minute, wring it out, and then air dry or use a dryer. High-quality materials: Our soundproofing foam panels made of flame-retardant and environmentally friendly materials, it is safe to use in small and medium-sized rooms. High-quality panels for better sound absorption, reduce waves, reverberation and flutter echoes in small to medium-sized rooms. The principle of soundproofing foam is that the sound inside the sponge is repeatedly reflected back and forth, thus achieving the effect of noise reduction and sound absorption. Acoustic panels not only have effective sound absorption properties, but also will not cause any harm to the body. The studio foam made of high-quality material can maintain its sound insulation function permanently. As for cleaning, just vacuum and dust them occasionally.