Factory OEM 6mm 9mm 3V 6 Volt DC Coreless Planetary 20mm DC Mini Geared Motor Cheap with Encoders for Sweeping Robot Model: ZWBMD006006-711Rated Voltage: 3VNo Load Speed: 26rpmNo load current: 40mARated Speed: 22rpmRated Current: 100mARated Torque: 296.9g.cmOverall Length : 30.9mmRated