178463 Suitable for RC helicopter， plane， boat and car. Look no further. Amazing product quality， that's solidly built. Best of all， its very affordable price. Buy instantly. Color: Blue Dimension: about 23 x 28 x 12.5 mm Connection line length: 250 mm Material: ABS plastic Stall Torque: 1.5kg/cm at 4.8V Operating Speed: 0.12sec / 60 degrees (4.8V no load) Dead Band Width: 10 usec Operation Voltage: 4.2 - 6Volts Note: Each servo has three different rudder arms. 1 x Servo 3 x Screw 3 x Rudder arm