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This kit includes 160 square feet of 2-inch Pyramid foam in 24-inch by 24-inch panels. Sonic Homework 2-inch Pyramid-shaped acoustic foam is best for increasing dispersion as well as absorbing unwanted sound, and is a premium-quality, yet cost-effective solution. 2-inch Pyramid foam, covering 25-50 percent of the walls in your room, will help control unwanted peaks and dips in the frequency response, clean up flutter echo, and improve stereo imaging. Sonic Homework Acoustic Foam has a density of 2.0lb per cubic foot, and is class-b flame-retardant Sonic Homework kits are shipped with premium adhesive tabs for installation. Just peel the backing and hang 'em up. The acoustic panels are shipped rolled and vacuum-packed for efficiency. Just open the bag and let the foam return to its original shape for up to 24 hours.