4 Pack- Acoustic Panels Studio Foam Convoluted 2.5" X 12" X 12" Sound Tiles"Egg Crate" Finish off your 2"-3" acoustically treated walls for an ultra clean look and added sound absorption Great for spot treating sound on walls in your studio or office - For use in recording studios, control rooms, Offices home studios, home entertainment theaters, Home Offices Product Care: Occasional Vacuuming of Dust. For professional acoustic control, sound dampening, acoustic treatment, noise reduction - Reduce waves, reverb and flutter echoes in smaller to medium sized rooms. MADE IN USA - Fire Retardant: CA Technical Bulletin 117