BW&reg; 2Pcs RC Speed Torque Micro Servo SG90 9g for 450 RC Helicopter Airplane Car Boat Operating speed: 0.12second/ 60degree ( 4.8V no load) Operating voltage: 3.0V - 7.2V Stall Torque : 1.5kg/cm at 4.8V Coreless motor,Dead Band Width : 7 usec Dimension : 22mm x 12mm x 29mm