a standard flat sided motor that we use in a lot of our products. 
Miniature circular DC motor, ideal for models and educational applications.Nominal voltage 3.0V with operating range 1.5 to 4.5V. The two flat sides enable easy mounting onto a panel.
Dimensions: L: 25 (exc. shaft) W:20.1 H:15.1mm. Shaft length 8.1x 2.0 dia. Weight 19g approx
Nominal voltage: 3.0V
Operating range: 1.5-4.5V
No load speed: 16000 RPM
No load current: 0.4A
Speed at max. efficiency: 12400 RPM
Current at max. efficiency:1.5A