Fangrui Product Details Professional Acoustic Treatment - The Newly Designed Shape Provides A Larger Sound Absorption Area. Therefore, They Effectively Reduce Reverb, Flutter Echoes, Undesirable Acoustic Reflections, Unwanted Noises. Improve Sound Quality Clarity - Acoustic Foam Panels Are Used To Control The Reverberation Sounds Make And This Is Quite Different From Soundproofing. It Can Reduce The In The Room, Improve The Sound Quality And Stereo Imaging. Perfectly Good For Video, Audio Recording, Meeting, Podcast, Live, Music Studio, And Gaming Room. Quick Recover To Normal Size - The Soundproof Foam Comes Compressed In A Vacuum Package, You Need To Place In A Well Ventilated Place For About 2 Hours. If Part Of The Acoustic Foam Can Not Fully Expand, You Only Need To Soak It In Water For 3-5 Minutes, Ventilate It To Dry For About 24 Hours, Be To Expand To The Normal Size. Note:with Adhesive Backing, The Color And Style Of The Adhesive Backing Are Random And Cannot Be Specified. Colour:black Gray Material:polyurethane Size