This 10-pack of DC vibration motors (standard non-vibration option also available) is perfect for DIY science projects such as Scribbel Bot, Brush Bot, Bristle Bot and Wobble Bot. They can be energized with a single AA battery (1.5V), but can handle up to 3V. Electrical Specs Voltage: 1.5-3V Max Speed: 12800 RPM Current: 0.16 A Torque: 5.9 g-cm Output: 0.604 W Stall Torque: 25.9 g-cm Motor Dimensions Body Size: 27.5mm x 20mm x 15mm Shaft Size: 8mm x 2mm diameter Eccentric Wheel Dimensions Diameter: 8 mm Thickness: 5 mm Weight: 1.8 g Note: Standard non-vibration option does not include eccentric wheel Motor Weight (with eccentric wheel) 18 g Motor Weight (without eccentric wheel) 16 g