Feature:1. MODULAR DESIGN FOR EASY MODIFICATION: Linear rail guide kit need no firmware or wiring modification. Easy to upgrade, start printing immediately2. LONG SERVICE LIFE: Linear rail guide upgrade kit is made of high carbon cr steel, possess strong wear resistance, fluent movement, low noise, uniform force and more sturdy3. HIGH SPEED PRINTING: The linear with low friction motion characteristics reduce energy lose and mechanical wear, enabling 3D printers to print at higher speeds4. HIGH ACCURACY PRINTING: The linear guide rail with high rigidity and high stability, which can maintain more excellent accuracy during motion, reduce printing vibration and inprove printing quality5. APPLICABLE MODEL: This 3D printer linear guide rail kit is compatible with for Neptune 3 Plus X axes and for Neptune 4 Plus X axes, meet can be usedSpecification:Item Type: Linear Rail Guide KitMaterial: High carbon cr steelApplication: For Neptune 3 Plus X axes, for Neptune 4 Plus X axes.Package List:1 x Guide rail4 x Slider1 Pack of Screw Accessories1 x Accessory