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!