Mybecca 2" X 12" X 12" Acoustic Panels Studio Foam Wedges, 48 Pack Highly Effective Sound Reduction - Removes echoes and unwanted Flutter NRC: 0.9 - 80% to 90% Eliminates Standing Waves And Flutter Echoes ; Reduces Unwanted Reflections; Reduces Unwanted Reflections Good for studios, recording studios, vocal booths, control rooms CA Technical Bulletin 117-2013 Flammability Standard Compliant