Feature:1. The gear is made of brass, which is more stable in terms of quality compatibility.2. The work is smoother with small size and good performance during transmission.3. Compatible with most 3d printers, for Makerbot or 1.75mm consumables.4. Great workmanship, perfect replacement for the old one and has a long service life.5. A large number, can meet your use and replacement needs, very practically.Specification:Item Type: 40 Teeth Drive GearProduct Material: BrassProduct Size: Approx. 11 x 11mm / 0.4 x 0.4inInner Hole: Approx. 5mm / 0.2inNumber of Teeth: M3Product Use: For Makerbot or 1.75mm consumablesColor Classification: Yellow Package List:20 x Gear