Name: BGM Gear Extruder Mechanism Model: Voron Extruder Parts Kit with Stickers. 4:1 gear reduction is required, excellent workmanship, quiet operation. Color: Silver Material: Metal Package Contents: 2 x Synchronous Wheels 2 x Extrusion Wheels 2 x Miniature Bearings 2 x Single Flange Bearings 5 x Brass Embedded Nuts 1 x 3mm Spindle 1 x 5mm Spindle 1 x Pneumatic Bowden Connector 1 x Screw 1 x Closed-loop Timing Belt 2 x Small Orange Buckles 1 x Spring with Washer Only the above package content, other products are not included. Note: shooting 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 +/- 1-3 cm.