Viper Wet Rag is a reusable heat blocking putty that keeps piping and sensitive components cooler than a traditional wet rag during brazing, soldering or welding.It is made from the same materials found in the heat shield of the space shuttle.Simply apply, remove and reuse.Specifications Protects Surfaces, valves and other sensitive parts from heat damage Blocks direct and conductive heat transfer No mess formula Use with MAP/Pro, Oxy/Acetylene, Mig, Tig, Arc and Propane torches Non-Toxic