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

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This 2.22″ x 1.45″ x 1.45″ gearmotor is a powerful, high-quality motor with 100:1 metal gearbox intended for operation at 12 V. These units have a 0.61″-long, 6 mm-diameter D-shaped output shaft. This gearmotor is also available with an integrated encoder.
Key specs at 12 V: 100 RPM and 300 mA free-run, 220 oz-in (16 kg-cm) and 5 A stall.