Pololu Metal Gearmotors
We offer a wide (and growing) selection of brushed DC metal gearmotors that will let you choose the optimal torque and speed for your application. The following link will take you to a parametric comparison table that can help you find a metal gearmotor that is just right for your project:
With a cross section measuring only 10×12 mm, these small brushed DC gearmotors are available in a wide range of gear ratios—from 5:1 up to 1000:1—and with four different motors: high-power with long-life carbon brushes (HPCB), high-power (HP), medium-power (MP), and low-power. Versions are also available with an optional extended motor shaft.