Ideal motors for hundreds of uses. Science projects, toys, electrical experiments and just a motor. Small but powerful. Operates on 4.5 to 6V DC. The terminals are connected by alligator clips on 12″ wires. Motor is 1.2″ (30mm) L x 0.93″ (23mm) dia., Shaft 0.358″ (9mm) L x 0.073″ (1.84mm) dia.