For over 25 years and millions of feet sold, Wrenchers have “Cooled Down” With JC Performance Header Wraps. Motorcycles, Minivans, Hot Rods, Muscle Cars, Vintage Cars, ATVs, Go Karts, Farm Vehicles, Mini Bikes, Aviation, Snowmobiles anything with an exhaust!! Save your leg on a motorcycle, retain heat to the cat on a modern import, cool down your engine bay on a hot rod, protect wires, hoods and parts! Designed to provide maximum heat retention with a premium lock weave, No asbestos or harmful chemicals YES just like a new or revived Engine newly installed wrap will smoke. Allow impurities to burn off! It will stabilize, it will not catch fire unless saturated with flammables We have several test reports on file.