These are standard '130 size' DC hobby motors.

• Operating Temperature: -10°C ~ +60°C
• Rated Voltage: 4.5-6.0VDC
• Rated Load: 10 g*cm
• No-load Current: 70 mA max
• No-load Speed: 9100 ±1800 rpm
• Loaded Current: 250 mA max
• Loaded Speed: 4500 ±1500 rpm
• Starting Torque: 20 g*cm
• Starting Voltage: 2.0
• Stall Current: 500mA max
• Body Size: 27.5mm x 20mm x 15mm
• Shaft Size: 8mm x 2mm diameter
• Weight: 17.5 grams