Qunqi MG996R Metal Gears Digital RC Servo Motor High Torque For Helicopter Car Boat High speed, stable and shock proof.High quality Stall Torque: 13 kg / cm (4.8V), 15 kg / cm (6.0V). Metal gear and double ball bearing Dimension: 40mm x 19mm x 43mm. Compatible with most standard receiver connector: Futaba, Hitec, Sanwa, GWS