1. How To The Normal Size Of The Acoustic Foam: 1. After opening the Vacuum package, place the Acoustic Foam in a ventilated place for 12-24 hours; 2. Or the foam in water for 1 , wring it dry, then air dry or use a blower dry.2. The principle of the soproofing foam is that the so inside the sponge is repeatedly reflected back and forth, thereby achieving the effect of noise reduction and so absorption.the acoustic panels not only have effective so absorption characteristics, also will not cause any harm to body.The high quality material studio foam can keep so insulation function permanently. In terms of cleaning, you just need to vacuum and dust occasionally.3. High-Density -Retardant Material: The so absorbing foam panels is made of -retardant and environmentally friendly materials, which can be used safely. The absorption spectrum is wide and over 500 HZ.High-Density material,which is higher than the industry standard of 30%. At the same time, it can also so quality: by absorbing harmful sos, reducing fluctuations, reverberation, and vibrating , Useful sos are clearer.4. Installation : It is recommended to stick the tape to the four corners and the center of the back of the acoustic foam panels, and then to the wall. Or you can purchase spray glue to install the soproofing foam according to your needs.5. For professional acoustic control Acoustic Foam Each comes uncompressed and in condition With professional acoustic control, so suppression, acoustic processing, noise reduction, the acoustic foam is to reduce the waves, reverb and flutter in small and medium-sized rooms.Acoustic panels is suitable for so recording studio, colour:BlackMaterial:Polyurethanesize:30 x 30 x 2.5cmPackage Contents:60 x Soproofing FoamOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm."