This is a Type K (Chromel/Alumel) 22awg stranded thermocouple wire. The yellow/red wires & brown jacket are Fluorinated Neoflon (PFA) insulated with a temperature rating of 500°F/260°C. The flame retardant PFA insulation is abrasion, chemical & moisture resistant.
Used with type-K thermocouples for CHT,EGT & TIT systems by Garmin & Electronics International & by Dynon & GRT for EGT & TIT systems.
(sold by the foot)