100% brand new and high quality. Features: Recommended slicer setting: retraction speed over 80MM/S; retraction length 2.5-4MM (0.10-0.16in). If you are facing PLA clogging problem, please try the followings: Increase the retraction speed. The speed may have being limited in the firmware try to change it. G-command "M203 E200" Increase the extruder acceleration. Check your firmware settings. G-command "M201 E9000" Reduce the retraction length. It depends on your machine setup. Increase the nozzle temperature by 5-10 degrees. Do not install the 2 screws for support the heatblcok like the stock hotend on the CR-10 printer. Make sure that there is no gaps between the heatsink and the heat breaker. Specifications: Material: Metal Size: approx.27x20mm/1.06x0.79in Color: As pictures shown Applicable Models: for CR-10 for CR-10S for Ender-3 for Ender-3 Pro for CR-10 S5 for CR- 10 -MINI for CR-20 for CR-20 PRO for TronXY X5S for Tevo Tornado for Alfawise U20 Quantity: 1 Set Note: Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you Package Includes: 1 x Throat 1 x Heat Sink 1 x Heating Block 1 x Brass Nozzle 0.4mm/0.02in 1 x Silicone Case (blue) 1 x Orange Buckle (other accessories demo in the picture is not included.)