This is the Futaba S9650 Digital Mini Servo with two ball bearings for helicopter and airplane use and comes with "J" connector pre-installed. Precision helicopter flying requires precise, high-tech servos, and it answers the call with new digital servos that reach full power immediately. It features high-capacity, high-current wire for low resistance while maintaining standard servo dimensions and light weight so you can mount them almost anywhere.
This is a High Torque, High Speed Digital Mini Servo from Futaba. Coreless motor, conventional servo motors have a steel core armature wrapped with wire that spins inside magnets. In a coreless design the armature uses a wire mesh that forms a cup that spins around the outside of a magnet. This arrangement is much lighter, which results in smoother operation and faster response time.
Spec:
Dimensions: 1.4 x 0.6 x 1.1" (36 x 15 x 29mm)
Weight: .92oz (26g)
SPEED: 0.14 sec/60° @ 4.8V
0.11 sec/60° @ 6.0V
TORQUE: 50 oz-in (3.6 kg/cm) @ 4.8V
63 oz-in (4.5 kg/cm) @ 6.0V 
