Feature:1. [Compatible Model] This Y axes guide rail is suitable for Neptune 3 Maximum and for Neptune 4 Maximum 3D printers, ensuring accurate and stable motion during printing.2. [Modular Design] There is no need for firmware or wiring modifications when using this linear guide rail, easy to upgrade, you can start printing immediately.3. [Sturdy Construction] Crafted from high carbon cr steel, this guide rail has strong wear resistance for long lifespan, stable motion, low noise, and uniform force distribution.4. [Low Friction] Featuring smoothly surface and low friction, this linear guide rail minimizes energy losses and mechanical wear, enabling faster printing speeds.5. [Enhanced Stability] With high rigidity and stability, this linear rail maintains superior accuracy during movement, reducing printing vibrations and increasing overall print effects.Specification:Item Type: Y Axes Guide RailMaterial: High Carbon Cr SteelApplication: for Neptune 3 Maximum Y Axes, for Neptune 4 Maximum Y Axes.Package List:2 x Y Axes Guide Rails8 x Slider Blocks1 Pack x Screw Accessories1 x Accessory