Feature:1. Long Service Life: Made of high carbon cr steel, this y axes linear rail features strong wear resistance, smoothly motion, low noise, even force distribution, more robust.2. High Speed Printing: Y axes linear rails with smoothly and low friction movement characteristics reduce energy loss and mechanical wear for faster printing.3. High Accuracy Printing: High rigidity and stability linear guides maintain superior accuracy during movement, reduce printing vibrations, and improve print quality.4. Modular Design for Easy Modification: You can easily upgrade your equipment without firmware or wiring modifications. Start printing immediately.5. Applicable Models: This 3D printer y axes linear rail guide kit is suitable for Neptune 3 PLUS Y axes, for Neptune 4 Plus Y axes. Check for better fit!Specification:Item Type: 3D Printer Y Axes Linear RailMaterial: High Carbon Cr SteelApplicable Model: For Neptune 3 PLUS Y axes, for Neptune 4 Plus Y axes.Package List:2 x Guide Rails8 x Guide Rail Brackets2 Packs x Screw Accessory1 x Accessory