6pcs Acoustic Panel Anti-Acoustic Cushion Wall Panel Echo Bass Insulation Cover Inclined Edge, Wall Decoration, 30X40X0.9cm1. High-quality materials: Our sound-absorbing foam panels made of fireproof and environmentally friendly material, are safe to use in small and medium-sized spaces. High quality panels for better sound absorption, reduce waves, reverb and flutter echoes in smaller to medium-sized rooms.2. How to regain the normal size of acoustic foam: a. After opening the vacuum package, place the acoustic foam in a ventilated place for 12-24 hours; b. Or soak the wetsuit in water for 1 minute, wring it dry, and then air dry or use a blower to dry.3. The principle of sound-absorbing 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 our body. The high quality studio foam material can keep its sound insulation function permanently. As for cleaning, you just need to vacuum and vacuum them from time to time.4. NRC 0.95-for laboratory tests on noise level reduction factor; These noise cancelling foam panels can be mixed and match the aesthetic look and design. Ideal for individuals to reduce and absorb unwanted echoes, waves, rev