Features [Compatible Model] This Y-axis guide rail is suitable for Neptune 3 Maximum and Neptune 4 Maximum 3D printers, which ensures accurate and stable movement during printing. [Modular Design] No need for firmware or wiring modifications when using this linear guide rail, easy to upgrade, you can start printing immediately. [Sturdy Construction] Made with high carbon cr steel, this guide rail has strong wear resistance for long service life, stable movement, low noise, and even force distribution. [Low Friction] With a smooth surface and low friction, this linear guide rail minimizes energy losses and mechanical wear, allowing for faster print speeds. [Enhanced Stability] With high rigidity and stability, this linear rail maintains superior accuracy during movement, which reduces printing vibrations and increases overall printing effects. 1. [Compatible Model] This Y-axis guide rail is suitable for Neptune 3 Maximum and Neptune 4 Maximum 3D printers, which ensures precise and stable movement during printing. 2. [Modular Design] No need for firmware or wiring modifications when using this linear guide rail, easy to upgrade, you can start printing immediately. 3. [Sturdy Construction] Made with high carbon cr steel, this guide rail has strong wear resistance for long service life, stable movement, low noise, and even force distribution. 4. [Low Friction] With a smooth surface and low friction, this linear guide rail minimizes energy losses and mechanical wear, allowing for faster print speeds. 5. [Enhanced Stability] With high rigidity and stability, this linear rail maintains superior accuracy during movement, reducing printing vibrations and increasing overall printing effects. Specification: Item Type: Y-Axis Guide Rail Material: High Carbon Cr Steel Application: for Neptune 3 Max Y axis, for Neptune 4 Max Y axis How to use: Take out the product for direct use. Packing List: 2 x Y-axis guide rails 8 x Sliding Blocks 1 Pack x Screw Fittings 1 x accessory. Package List 2 x Y Axes Guide Rails 8 x Slider Blocks 1 Pack x Screw Accessories 1 x Accessory