Self-supported coils or air core coils are characterized by the fact that typically no magnetic core material is used. They are usually wound on non-magnetic cores and stable in form dimensionally stable or wound on non- magnetic cores in itself. For baked varnish coils a specially coated wire is used which is baked at temperatures of around 200 °C during or after winding. With its many years of experience in applying this technology, the WERAP Wicklerei AG can call itself without exaggeration a specialist.