The PolyPro Welder has a single purpose... to weld polypropylene. This unit is the same as our ATV Fender Welder except that it has polypropylene welding rod rather than polyethylene welding rod. Polypropylene is used for many things including gas tanks, bumper covers, fender wells, headlight housings, and many more. Each PolyPro Welder Kit contains: 200 watt ceramic core heating element Standard welding tip Stainless steel reinforcing mesh 30 feet of black polypropylene welding rod