Turnigy digital micro servo offering great torque, speed, excellent centering and a great price! The gear train is a combination of metal, carbon and plastic gears. Specs:Weight: 9.0gramSize: 23.1mmx12.0mmx24.9mmTorque: 1.9kg.cm (4.8v) – 2.1kg.cm (6.0v)Speed:  0.11sec/60deg (4.8v) – 0.09 sec/60deg (6.0v)Voltage: 4.8-6.0vType: Digital MicroGear Train: Metal/plastic/carbon Ball Bearing:  NoPlug: JR/Futaba