Features 1、MODULAR DESIGN FOR EASY MODIFICATION: Linear rail guide kit need no firmware or wiring modification. Easy to upgrade, start printing immediately 2、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 sturdy 3、HIGH SPEED PRINTING: The linear with low friction motion characteristics reduce energy lose and mechanical wear, enabling 3D printers to print at higher speeds 4、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 quality 5、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 used Specification Item Type: Linear Rail Guide Kit Material: High carbon cr steel Application: For Neptune 3 Plus X axes, for Neptune 4 Plus X axes Package List 1 x Guide rail 4 x Slider 1 Pack of Screw Accessories 1 x Accessory