⭕ Quality Assurance : Creality 100% official, the stepper motor 42-40 is for Eixe of the Ender and CR-10 series (e.g. Ender-3 / Ender 3 Pro / CR 10 / CR 10S etc.). 42-40 stepper motor is original and high quality from 100% quality assurance. 🆗 Low Noise: Creality stepper motor adopting high quality motor steel material with low powder, uniform speed,stable performance,low noise. This greatly reduces the vibration and noise when the engine is working, reduces your anxiety, and does not affect the rest of your family and children. ⭕ High Guality Stepper Motor: Stepper motor wirh low noise and efficicent heat dissipation haas the large torque and high precision without losing steo.This means that you can save on the cost of replacing or repairing the engine. 👍 More Precise and Accurate: Creality stepper motor perfectly fits the synchronous gear slot and the synchronous belt tooth slot, with a precise and constant ratio to ensure the stability of the motor structure and achieve the ideal uniform rotation effect, while avoiding system errors and obtaining accurate results. 👍 Creality Official Store: We are the official Creality 3D store! We provide professional after-sales support, and more than 20 engineers provide 24/7 customer service, please kindly contact us directly (seller) via "ask a question".