2368-POLOLU 150:1 Micro Metal Gearmotor MP 6V
This gearmotor is a miniature medium-power, 6 V brushed DC motor with a 150.58:1 metal gearbox. It has a cross section of 10 × 12 mm, and the D-shaped gearbox output shaft is 9 mm long and 3 mm in diameter.
Key specs at 6 V: 150 RPM and 40 mA with no load, 28 oz-in (2.0 kg-cm) and 0.7 A at stall.