Insopack Acoustic Foam wedges are effective against standing waves and flutter echoes in most small-to-medium sized rooms. Brand New Tile Acoustic Foam Made by High Quality PU Sound-Absorbing Foam with High density acoustic foam cell structure for maximum noise absorption that helps to flutter echoes, reduce excess reflections, reverberation Improves vocal clarity of acoustics of your room. Ideal for use in recording studios, home theatres and karaoke rooms.