[Quality Assurance]for official 3 V3 SE Extrusion Kit. The shell of Ender3 V3 SE extrusion is made of plastic, and the extruded gears inside are made of metal material. Compatible with for S1/ S1 Pro/-5 S1//Sermoon V1/ V3 SE/ V3 KE 3D Printer. [Dual Gear For Stable Printing]The 3V3 SE direct extruder with dual gear drive does not damage the filament, supports stable, smooth and precise filament feeding. [Large Torque Smooth Feeding]The use of gear with 3.5:1 gear ratio which perfectly matches with motor makes extrusion force up to 80N (depending on filaments). More precise control of feeding withdrawal. [Easy to Operate]Labor-saving wrench design makes it more convenient and faster to insert filament. With adjustable tensioner, allows you to fine-tune the pressure exerted by gears onto the filament to print more exquisite models. Colour: Black Material: plastic+metal Package Contents: 1 x Dual Gear Extruder Only the above package content, other products are not included. Note: Light reflection 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.