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STP Black is a self-adhesive flexible and elastic vibration dampening material. The matieral consists of an embossed black foil face, a base layer of butyl rubber with an adhesive polymeric layer. The material is water and enviroment resistant, and has corrosion and self sealing properties. The butyl rubber backing functions in temperatures from -50F to 212F. The polymeric layer allows an easy mounting to the vibration surface (peal and stick) and avoids using hazardous glues containg solvants. The STP Black may be mounted to complex surfaces without the need to be heated while being mounted. Packaged in easy to handle and install rectangular sheets, which conform to uneven surfaces and can be easily cut with household scissors or knife (if necessary). Read more details and specs here