Aluminum Case(middle) + Plastic(upper, short middle, bottom) Full Metal Gear Operating Voltage : 4.8 ~ 6.0V Operating Temperature Range : -10 to +60 Degree C Operating Speed : (4.8V) : 0.09sec (6.0V) : 0.07sec Dynamic Torque : (4.8V) : 5.4kg-cm / 75.1 oz-in (6.0V) : 6.2kg-cm / 86.2 oz-in Motor Type : high efficient Cored dc motor Size : 39.5*20.0*38.6 mm Weight : 54 g