These gear motors are made with steel gears (not plastic or sintered metal).  They run great and we've tested them extensively on our All-Terrain-Robots and Vectoring Robots.  We sampled many other manufactures and the gears would strip or the windings would burn up, we had no failures with these.

We recommend controlling the motors with one of our motor speed controllers. See our motor controller support page for more information.  We also recommend you use our wiring kit to wire your motors to control the electronic noise generated from any DC motor.  See our motor wiring support page for more information. 

The table below lists its characteristics.  The images above show current and torque curves and dimensions.  These motors have a stall torque of  30 kgf-cm!  They utilize a 1:24 gear reduction.  The gear motor is 24VDC.