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.