Features: Performance: With anti blocking and anti burning protection function, with waterproof function. CNC precision gear, it is more wear-resistant and not easy to break and sweep teeth. Metal gear high torque for RC car, crawler and robot. Great choice for university professors and students who are interested in developing software for robot parts. If there are any problems, please contact our store in time. We will give you a satisfactory solution. Specifications: Item: 25kg Digital Servo Rotation Angle: 270 Degree Stall Torque (5V): 21 kg/cm Stall Torque (6.8V): 24.5 kg/cm Speed : 0.15 sec/60(5V) / 0.13 sec/60(6.8V) Operating Voltage: 4.8 ~ 6.8 DC Volts Dead Brand: 3s Motor Type: DC Motor Gear Type: Copper & Aluminum Working Frequence: 50-333Hz Size: 40 * 20 * 40.5 mm Package Information: Package Size: 12*5*6cm Package Weight: 260g Gift Box Package Packing List: 4* 25KG Digital Servo 4* 25T Servo Arm