HIGHER TEMP RESISTANCE --- The upgraded white heater can bear higher temperature up to 340-350 degree. The temperature measurement of the thermistor: -50 °C ~ +300 °C, it can replace the original K-type thermocouple temperature, very fit for printing high-temperature filament. Please make sure your heater block can insert the thermistor successfully before purchasing as it's bigger than the normal one in the market. LONGER SERVICE TIME --- Heater and thermistor have longer service time because of the use of 304 stainless steel. Internal of the heater use 2080 nickel chrome wire. For customers' convenience, the wires adopts line connection, the customer can tear the wires depends on their application. The high temperature line is double thicker than others in the market, not easy to break off. PACKAGE INCLUDE --- 4PCS 24V 50W upgraded ceramic cartridge heater and 4PCS HT-NTC 100K upgraded temp sensor.