... . Overall Jacket:Fibergla Thermocouple Extension wire Type KX- 2x24 AWG FG/FG - ANSI1, SUBJECTFiberglass braided insulated thermocouple wire, type K, stranded wire ... like KCA, KCB and so on. Type KX- 2x24 AWG FG/FG - ANSI Thermocouple Extension Wire