(used) CR1 Hotend. A drop-in upgrade for all Creality machines. I bought this hotend and it just did not work out for my application. It was only used about 15 mins. Note: I was using PLA so it does have some Pla on it and in the nozzle Main features: 1) Chrome plated copper heat block 2) High performance titanium heatbreak 3) Dual sensor support 4) Compatible with all industry standards - use any heater cartridge, any sensor and any RepRap nozzle. 5) At least 30% higher flow rate vs original. 6) Heck of a value for this price! :)