This listing is for 1 T-Type Thermocouple extension cable, with a miniature male and a miniature female t type thermocouple connector. They conform to the miniature connector dimensions with flat blades and the T-Type Thermocouple Extension Wire specification. This means the metal prongs and the wire are made from compensating metal, the same material as the T-type thermocouple wire, which is copper / constantan. This means the impact of the extension wire on the temperature reading is minimized. Cable Insulation: PVC, stable up to 221 degree Fahrenheit F or 105 degree Celsius C. Connectors: High quality ABS plastic housing, stable to 248 degree Fahrenheit or 120 degree Celsius. This is also available in 3 ft, 9 ft, 12 ft or 15 ft. These are made to order in St Paul, MN, USA, from imported components.