The S650 is a standard-size surface servo designed for dependable control in compatible RC vehicles. Its nylon gear train helps keep the servo lightweight while providing practical durability for everyday driving. Operating at 6.0V, it produces up to 82 oz-in (5.9 kg-cm) of torque. The 23-tooth spline provides compatibility with Spektrum servo horns and other compatible accessories. Its compact standard-size housing makes it suitable for steering, throttle, or other control applications where a basic replacement servo is needed. Spektrum lists it as a 5Kg plastic gear servo.