Acoustic Foam Panels, 12 Pack Set 12" X 12" X 2" Black and Red Studio Wedge Tiles, Sound Absorber Soundproofing Wall Foam Mushroom Acoustic Panels Control Sound Dampening Foam (2 inch) - Walmart.com
JBER Acoustic Sound Foam Panels, 24 Pack 2" X 12" X 12" Red and Black Soundproofing Treatment Studio Wall Padding Sound Absorbing Fireproof Pyramid Wedge Tiles-JBER