Product Name: 91A 0.3M Plastic Gear 9 Teeth POM Gear Pinion Material: POM Plastic Color: White Modulus: 0.3 Modulus Height: about 4.12mm Gear Outer Diameter: 3mm Bore: 1mm, tightly suited to 1mm shafts Usage: Press the tools into the motor with 1mm shaft diameter, generally appropriate for 720/820 and different hole cup motors Pack Quantity: 1/10/100Pcs