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Wedge surface-The wedge surface of -12 grooves increases the contact area with sound waves, and the sound absorption effect is better than other shapes of surfaces. Manufactured to Absorb standing waves and flutter for better acoustics results. High density, open-celled acoustical foam panels which absorb mid to high-frequency reflections and control the ambiance of any room. PRODUCT IS SHIPPED AS 3 TILES, EACH TILE Splits into "2 WEDGES". Once You Split - Each egg crate foam acoustic foam soundproofing Foam panels HIGHEST point reaches 1.5 inch height. Its LOWEST point reaches 1/2 inch in height. / Overall Noise Reduction Coefficient (NRC): 0.40