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Material: Made of good quality Aluminum Alloy, Surface oxidation treatment,Sturdy, fine workmanship Install:Already assembled,you don't need to assemble it by yourself,direct installation and ready to use Function:you can adjust the belt freedom, more better than original Widely Used: widely used for 3D Printer Ender-3 Series etc Package Content: 1 Kit 2020 Profile X-axis Synchronous Belt ,1 Kit 4020 Profile Y-axis Synchronous Belt Stretch Straighten Tensioner