... ”, it means Type K, 20AWG, Solid, Conductor insulation: FEP, Metal shielded: Stainless steel, Overall insulation: FEP.Overbraids:All above thermocouple and extension wire also ... Order No., such as “JX-FEP-FEP-SSB-20S”, it means Type JX, 20AWG, Stranded, Conductor insulation: FEP, Overall insulation: FEP, Overbraid: Stainless steel. 2. Color ...