Features: 100% brand new and high quality Made of metal material and has a longer service life than a plastic arm. Upgrade Bearing. The bearing with teeth, it can hold the filament tightly and easy to extrude filament, and never slip. The spring on the extruder idler arm are strong enough to hold the filament, and also easy to unload change filament. Compatible with Titan AeroPrusa i3 MK2 Ultimate Artillery Sidewinder X1 Genius. Suitable various Filament, like PLA ABS and other soft filament, help you make your 3D printing work more wonderful. Package Includes: 1 x Extruder Idler Arm Specifications: Material:Metal Color:Black/Silver Size:5.6x3.8x0.8cm/2.2x1.5x0.31inches note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.