This Kit is Upgraded, the heating block upgraded to chromium-zirconium copper nickel plating treatment, high temperature resistance 500C degree printing, fast heat conduction. The radiator and heat break can be disassembled and locked by the side fixed shaft to reduce the use cost. The interference of the TC4 titanium heatbreak tube and the heat block increase s the step surface at the bottom of the throat to completely eliminate the phenomenon of falling off and reduces the possibility of leakage. The nozzle is connected by thread, and in contact with the bottom step of the heatbreak to completely solve the phenomenon of falling off and reduce the possibility of leakage. The removable nozzle can be replaced easily, Save time. Package: 1 set hotend , 1 pc extra hardened steel nozzle 0.4mm as spare part