Servo specifications:Torque (kg-cm): 42 (6.0V) / 51 (7.4V) / 57 (8.2V)Speed: 0.142 s (6.0V) / 0.115 s (7.4V) / 0.104 s (8.2V)Stall Current (at locked load): 5.8A (6.0V) / 7.4A (7.4V) / 8.2A (8.2V)Working Voltage: 6.0V ~ 8.4V DC VoltsWorking Frequency: 1520µs / 333HzDead Band: 0.0008 ms (Default)Bearing: 2* Ball BearingGear: Metal Alloy GearMotor: Japanese-made Brushless MotorWeight: 74 g (2.61 oz)Dimension:40 x 20 x 38.5 mm