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1 inch wedge foam provides moderate sound control on walls or ceilings. This product provides strong noise reduction , where moderate deadening is desired. 1 inch wedge foam is most effective on mid-to-high frequency ranges. Our foam is engineered to be aligned perfectly with the next piece to provide professional installation. Use: Perfect for use on walls, ceilings, doors, windows etc. Anywhere to help block sound and prevent echoes inside the room. Your package includes 48 pieces (24 sets), each tile splits into 2 tiles.