Feature: 1. Programmable: The RC gear servo has built in programmable PWM digital amplifier and 32 bit MCU with 14 bit magnetic encoder. 2. Aluminium Alloy Housing: Adopted aluminium alloy radiator shell with diamond cutting, the RC gear servo shell has great heat dissipation, and double ball bearings support the output shaft. 3. High Torque: The torque of this RC steering servo is up to 29kg/cm at 6V, 34kg/cm at 7.4V and 38kg/cm at 8.4V. The speed is up to 0.12s/60 degree at 6V, 0.10s/135 degree at 7.4V, 0.09s/60 degree at 8.4V. Wide working voltage DC6‑8.4V. 4. High Accuracy Component: This 38KG coreless motor servo features high accurate helical gear, double ball bearings support the output shaft, stable and reliable performance. 5. IP67 Waterproof: This RC gear servo is IP67 waterproof and has high performance and it is applicable to RC cars, robot, mechanical arm, etc. Specification: Item Type: 38KG Coreless Servo Shell Material: Aluminium alloy Gross Weight: 117g / 4.1oz Color: Black Product Size: 40x20x38mm/1.6x0.79x1.5in Working Voltage: 6V-8.4V Operating Speed: 0.12s/60 degree at 6.0V 0.10s/60 degree at 7.4V 0.09s/60 degree at 8.4V Stall Torque: 29.0kg-cm at 6.0V 34.0kg-cm at 7.4V 38.0kg-cm at 8.4V Connector Plug: JR plug Pulse Width: 500-2500usec Deadband: 2usec Application: RC remote control vehicle, robot, mechanical arm, etc . Package List: 1 x RC Gear Servo1 x Metal Servo Arm2 x Plastic Servo Arm4 x Screw Cartridge4 x Rubber Pad6 x Screw