Description: Useful upgrade parts fir for series printer, you can adjust the belt freedom,more better than original.. Material: Steel material, composed of high Y-axis synchronous. Easy to operate, simple combination installation and use.. Surface anodizing treatment, effective protection, can extend the service life. Suitable : for CR-10 S4 400mm or S5 500mm size 3D Printer. Specification: Item Type: Mechanical Kit / Hardware Parts Model Number: for S4 / S5 3D printer Condition: NEW Material: steel Color: Black Apply: CR-10 4S / 5S pulley width: for 10mm width belt Package Includes: 1x Y axis timing belt tensioner