Soundproofing material is a high density, non porous material that exhibits a non-resonant quality due to its flexible nature, and is one of our most popular soundproofing products. This item controls noise by blocking the transmission of sound energy and damping vibrations caused by sound energy. Constructed of heavy metal powders, vinyl and plasticizers, it is very heavy, yet very flexible. At 3mm thick, weighs 2.6 or 4.2kgs per square meter, which has better noise reduction characteristics then steel and other building materials.