Servo B7 Revolution PRO Torque(6.0V): 10.0 kg-cm (138.8 oz/in) Torque(7.4V): 13.0 kg-cm (180.5 oz/in) Speed: 0.065 sec (6.0V) │ 0.055 sec (7.4V) Operating Voltage：6.0 ~ 8.4 DC Volts Weight: 47.0 g (1.66 oz) Bearing Type：Ball Bearing x 2 Motor Type：Brushless Motor Gear Type：Titanium & Steel Operating Temperature：-20℃~60℃ Working frequence：1520μs / 333hz Size：41.0 x 20.0 x 26.4 mm ( 1.61 x 0.79 x 1.04 in)