Let Everyone Enjoy A Life Without Noise Acoustic Foam Made Of 100% Polyurethane Environmental Protection, Sound Absorption, Flame Retardant Suitable for professional studio, rehearsal room, concert hall, podcast, church, home theater, vocal studio, home studio, office, human cave, dog house, utility closet, etc Soft sponge, no dust, high density, environmental protection, easy to install Features: Use the open-pored structure to increase its sound absorption capacity and optimize its internal porosity, reduce the interference and reverberation of indoor reflected sound, improve the purity of the sound, adjust the indoor sound field and reverberation, and make the sound pleasant to the ears