Description:
This is a decent and low cost unipolar stepper motor. It has a small reasonable torque and a good speed for small projects.

Specifications:

• Motor Type: Unipolar Stepper
• Manufacturer Part Number: PM25L-048-15
• Step Angle: 7 1⁄2°
• Step Accuracy: 7 %
• Holding Torque: 140 g·cm
• Rated Torque: 50 g·cm
• Maximum Speed at Rated Voltage: 240 RPM
• Rated Voltage: 12 V DC
• Rated Current: 100 mA
• Coil Resistance: 120 Ω
• Shaft Diameter: 2 mm
• Weight: 31 g
• Number of Leads: 6 wires
• Wire Length: 300 mm

Resources:
Stepper Motor and Controller Primer
Wantai Data Sheet