RoHs compliant, Certificate of Conformity.Classent is a the professional R&D in sound and heat insulation.Used on Automotive parts, generators, marine compartments and construction sites.Made of Reinforced butyl - highest ability to resist heat and insulate sound. It&＃39;s compressed on a aluminium and lead barrier topped with a multi-layer of thermal acoustic foam. It is the new level of soundproofing technology used.We major exports for car vinyls. Quality Assured.