Feature:1. Better Effects: Ensuring smoother feeding of filament, this extruder kit enables good printing effects and high efficiency.2. Reliable Works: Large torsion meshing gears promises no material slipping and easy adjustment as well, stable and reliable.3. 37Pcs in Total: Includes 37pcs accessory, such as synchronized wheel, extrusion wheel, miniature bearing and so on.4. Good Materials: Combining high quality brass and stainless steel materials, not likely for break and very durable for uses.5. Easy to Install: Thanks to the light weight and compact size, the simple installation can be quickly completed in minutes.Specification:Item Type: 3D Printer M4 Extruder KitMaterial: Brass, stainless steel. Product Specifications:2 x Synchronized Wheel2 x Extrusion Wheel2 x Miniature Bearing2 x Unilateral Flange Bearing5 x Brass Insert Nut1 x Short Pin1 x Long Pin1 x Pneumatic Connector1 x Closed Loop Timing Belt2 x Orange Small Snap1 x blue accessory1 x Spring Bolt12 x Screw3 x Washer1 x Sticker Kit (3pcs)1 x Storage Box.Package List:2 x Synchronized Wheel2 x Extrusion Wheel2 x Miniature Bearing2 x Unilateral Flange Bearing5 x Brass Insert Nut1 x Short Pin1 x Long Pin1 x Pneumatic Connector1 x Closed Loop Timing Belt2 x Orange Small Snap1 x Blue Accessory1 x Spring Bolt12 x Screw3 x Washer1 x Sticker Kit (3pcs)1 x Storage BoxNote:Pay attention to the correct operation.