hot spring heater 1,sectional dimension:3mm X 3mm, ... 4.5mm X 4.5mm.. 2,100W-1800W 230V hot spring heaterhot runner coil heater may be bent into shape ... steel, internal insulating materials for high purity magnesia, spring heating circle by high temperature bake and become, ... full heating contact area, has high heat conduction, spring heating circle mechanical impact resistance to high temperature, strong ...