Easy to install-unbolt the old original plastic extruder and screw in the new metal extruder,then it is ready to print.Suitable for 1.75mm filament 3D printer MK8 bowden extruder frame Application-MK8 extruder drive feed kit,it can replace acrylic parts of CR-10 Series,CR-10 S4,CR-10 S5,CR-10 Mini,CR-10S,CR-10 Plus printer Stable and durable-the MK8 extruder kit made of aluminum alloy material,more stable and durable than the original plastic one while working Advantages-the metal extruder have stronger pressure to pushing the filament into printer nozzle,improve the printer's performance.You can adjust the extruder gear pressure by the adjustable bolt on your demand Warm note-there are many small parts in the package,for safety,please keep away from your child color:red Material:aluminum alloy Package Contents: 1 x Creality 3D-Extruder Upgrade Kit 1 x 1M PTFE PTFE Bowden Tube(2.0mm ID/4.0mm OD) Only the above package content, other products are not included. Note: Light shooting 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.