[Compatible 3D Printers]: This 2pcs extruder end replacement kits are only for S1/ S1 Combo 3d printers, not for other 3d printer models. Please confirm your 3d printer model before ordering. [ 3D Printer Accessories]: Includes 1 packs assembled end kits parts: high precision nozzle, throat tube, heater block thermistor and heater for smoother printing and better 3D printed models. [Support High Speed Printing]: Semi-assembled end with all-metal throat design makes the print head heated evenly and the filament flows smoothly in the throat nozzle to support high speed printing. And produced by a rigorous design and testing team, no leakage and clogging, you can easily start your 3D printing experience. [Warm Note]: We kindly suggest you please check whether each part is tightened before use, because the assemble end kit be loosened during portation. Then after installing this end print head kit, we suggest you to re-level the heat bed. It is not recommended to replace the nozzle of this end. Please note: the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! Colour: As Shown Material: Brass Package Contents: 2 x 3D Printer End kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.