Synchronous Belt Straighten Tensioner: It comes as a set of Y- belt stretch kit, you need to install it by yourself.; Straighten Tensioner: Surface anodizing, effective protection.; Y- Synchronous Belt Tensioner: Surface anodizing, effective protection.; Printer Stretch Accessories Profile: Easy to operate, simple installation and use.; 3D Printer Synchronous Belt: Compatible for Ender-3, -10, -10S and other 3D Printer.

What's in the box
2 x 3D Printer Replacement Parts & Kits