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KTOESHEO 24 Pack Acoustic Panels,2" x 12" x 12"Sound Proof Foam Panels for Wall,Fireproof Absorbing Noise Cancelling Panels,to Absorb Noise and Eliminate Echoes. (12 purple+12 black)
$62.88
"There's still a little echo in the stream room. A few of these will go a long way"