The 28-BYJ48 stepper motor is one of the most commonly used stepper motors. You can find this or similar motors in your DVD drives, motion cameras, and many more similar devices. The motor has a 4-coil unipolar arrangement, and each coil is rated for +5V; hence, it is relatively easy to control with any basic microcontroller.

Specification:

• Rated Voltage: 5VDC
• Number of Phases: 4
• Stride Angle: 5.625°/64
• Pull in torque: 300 gf.cm
• Insulated Power: 600VAC/1mA/1s
• Coil: Unipolar 5 lead coil

Datasheet: http://archive.communica.co.za/Content/Catalog/Documents/D4103231007.pdf