Wirestripping and Reflow systems differ from the other styles of resistance soldering systems, as these systems pass a controlled current through a closed-loop resistive material, creating a hot formed wire that can be used to strip insulating jackets off wires (including Teflon and other PTFE-type materials), used as a hot-knife to melt and trim plastics and waxes, reflow solder balls, and even perform some Pyrography (wood burning art).