S15-X Specs:Torque(6.0V): 11.5 kg-cm (159.7 oz/in)Torque(7.4V): 15.0 kg-cm (208.3 oz/in)Torque(8.4V): 16.5 kg-cm (229.1 oz/in)Speed: 0.072 sec (6.0V) ¦¢ 0.060 sec (7.4V) ¦¢ 0.050 sec (8.4V)Operating Voltage: 6.0 ~ 8.4 DC VoltsWeight: 57.5 g (2.03 oz)Bearing Type: Ball Bearing x 2Motor Type: Brushless MotorGear Type: Titanium & SteelOperating Temperature: -20¡É~60¡ÉWorking frequency: 1520¥ìs / 333hzSize:41.0 x 20.0 x 26.0 mm ( 1.61 x 0.79 x 1.02 in)