HIGH DENSITY PREMIUM QUALITY ACOUSTIC STUDIO FOAM GREAT FOR SPOT TREATING YOUR LISTENING ENVIRONMENT | Helps block sound to reduce noise and prevent echoes inside the room. Ideal for music studios, recording studios, home theaters, vocal booths, karaoke studios, etc. | CONTROL YOUR ROOM'S ACOUSTICS - Reduces standing waves and flutter echoes in small to medium sized rooms. Our products are fire rated and passed CLASS A ASTM E84 test (for residential applications)! | 1 sheet of egg-crate acoustic foam measures 39 inches by 78 inches (exact measure 1 meter width x 2 meter long) and 1 sheet covers 21 square feet. for orders of two or more of these egg crate sheets we tape two together at the back and roll into one large sheet. | Foam has self adhesive backing for easy installation Please allow a few days for the foam to return to its original shape.