1Good Performance: This X axes linear rail kit has sleek and low friction motion characteristics that linearly reduce energy loss and mechanical wear, allowing the 3D printer to print at higher speeds. 2High Accuracy: This 3D printer X axes linear guide has high rigidity and high stability, maintains better accuracy during movement, reduces printing vibration, and improves printing quality. 3Excellent High Carbon Cr Steel Material: This 3D printer linear rail is made of excellent high carbon Cr steel material, which is strong and abrasion resistant, not easy to be damaged, and has a long service life. 4Good Compatibility: This 3D printer linear guide rail has good compatibility, it is suitable for Neptune 3 MAX, for Neptune 4 MAX, and can be used to replace the old and damaged rails, very practical. 5Modular Design: This printer linear rail guide kit features a modular design that requires no firmware or wiring modifications, is easily upgradable, and starts printing as soon as it is installed. 1 x Guide Rail 4 x Sliders 1 Pack x Screw Accessories 1 x Accessories