This 1:192 Tiny Geared Pager Motor has an offset shaft much like the GM2, but is roughly half the size in every dimension. We suspect that these were the motors used for the Magic school bus in it's miniature state.
Call it a teeny, tiny little brother to the GM3 gearbox. With a suitably smaller appetite for power!
A bit slower than the GM13, but less current consumption. Less expensive, too!
The 100:1 Mini Metal Gear Motor is about 25% more motor than our GM12a (in speed, torque, and power consumption), but has an enclosed gearbox!
Much like the GM11-14 series of gear motors, but with a larger motor!
The MCM2 is a collection of high-quality precision parts in a cassette mechanism with 2 motors ideal for BEAM hacking.