The phase resistance of the 5mm stepper motor is 14 ohms. The primary gear teeth of the motor are plastic gears, while the output shaft of the reduction is a 1.6mm flat shaft. Straight tooth reduction and planetary reduction with all metal planetary gears inside. new micro 2-phase 4-wire 5mm stepper motor with planetary . Note that the lead foot cable of this stepper motor is relatively fragile and should be handled with care to avoid breakage., Weight: 0.0110231131 Pounds, Manufacturer: Oewwthy