Stranded wire cable with PTFE insulation.

Specifications

Sensor Range: -58 to 482°F (-50 to 250°C)
Transition (SST): Max temp 482°F (250°C)
Cable: -58 to 482°F (-50 to 250°C)
Time Constant: Less than 0.5 seconds typical in liquid. Less than 2.5 seconds full reading.
Accuracy: ±0.4°F (±0.2°C) from -4 to 158°F (-20 to 70°C)