[UPGRADED PARTS]: Replacement Belt Tensioner Parts,The machine only have a belt pulley,Now you can adjust the belt freedom,Easier to adjust belt, higher precision and better printing effect. The X-axis and Y-axis belt can be adjusted at any time by turning the screw by hand.[STURDY ALUMINUM PROFILE]: Made of aluminum alloy material, durable to use.Surface anodizing , effective protection.beautiful appearance and excellent wear rate.[COMPATIBLE WITH]: This belt tensor only suit for Artillery Sidewinder X1.please confirm your machine model before order[DIY 3D PRINTER KIT]: Package include all parts.No-Solder, No-Tape, No-Adhesive Assembly And Maintenance,Easy to Install.Colour:blueMaterial:MetalPackage Contents:2 * Belt TensionerOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.