Genuine Creality 3D® Product with GENUINE Creality 42-34. Some third party upgrade kits are including non-Creality stepper motors.
You can never go wrong if always purchase genuine parts despite whatever savings they seem to offer. Packaged in Creality original packaging within padded foam cradle direct from Creality in Shenzhen.
Increased Accuracy Compared with original design, the dual Z-axis upgrade reduces the layer ripple caused by Z-axis vibration.
Quality Unlike some of the third-party upgrade kits, the power supply bracket is METAL! Unlike third-party upgrades, Creality includes the second pillow bearing mount to strengthen your existing Z-Axis drive.
I am shutting down the parts business so these are in a "Last Call!" stocking situation. These have become rare and hard to find since they support the larger power suply that came with Ender 3 / Pro V1 versions.