Hobbypark HDR315M 15kg Digital High Torque Robot Servo Motor 180 Degree Metal Gear With U Mouting Case (Pack of 2) 100% Original Hobbypark HDR315M 15kg Digital High Torque Robot Servo full Metal Gear Stall Torque :Stall Torque:13.5kg/cm5v) ;15kg/cm(7.4v) Operating speed: 0.14 sec/60 (5v); 0.13sec/60degree (7.4v) Dimension: 402040.5mm Double bearings & All metal gears