MelaMax Acoustic Foam Blocks
MelaMax SoundBlocks are thick 1' x 1' cubes of open cell class A fire rated melamine foam. These anechoic wedge panels are available in standard 6" or 8" thickness, and can be custom cut to any thickness for your anechoic foam treatment. These acoustic foam panels are used for maximum sound absorption in anechoic chambers, dyno rooms, and also serve as bass traps in music room settings where soundproof foam absorbs low bass reverberations.
More information: http://www.controlnoise.com/melamax-sound-blocks/