Upgraded Dual Gear Extruder Kit for Creality CR10S Pro, CR10, CR-10 S4/S5, Ender 3, Ender-5 & Tornado 3D Printers - Aluminum MK8 Metal Bowden Extruder Replacement - Perfect for High-Precision 3D Printing & DIY Projects

The item itself is exactly as described. It works as it is expected to and is easy to install - as long as you take pictures BEFORE you remove the old one from your 3d printer.I opened the box to check the pieces and realized that it did NOT come with instructions. Thankfully I had not removed the old one, so I took plenty of pictures before I disassembled the piece from the 3d printer, it also helped that I had changed out the same piece on another printer before so I had SOME idea of the assembly.Overall, no complaints. I gave my review 4 stars simply because there should have been SOME instructions to make i easier to install. My printer works again so I am happy.