Getting its name from the way the gears rotate like the planets around the sun, the Tamiya Planetary Gear Box is a precise, high quality gearbox with a RE-260 motor built into the gear box itself to add to its compactness. A wide range of gear ratios can be attained, and two kinds of crank arms are supplied for a wider range of functions. Produces 15kg-cm of torque at 400:1 gear ratio.