Pololu 12V, 100 RPM, 16 kg-cm, 100:1 Gear Motor w / Encoder

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This 2.71″ × 1.45″ × 1.45″ gearmotor is a powerful 12V motor with a 100:1 metal gearbox and an integrated quadrature encoder that provides a resolution of 64 counts per revolution of the motor shaft, which corresponds to 6400 counts per revolution of the gearbox’s output shaft. These units have a 0.61″-long, 6 mm-diameter D-shaped output shaft. This gearmotor is also available without an encoder.
Key specs at 12 V: 100 RPM and 300 mA free-run, 220 oz-in (16 kg-cm) and 5 A stall.