This is Tower Pro SG-91R Micro Servo for helicopter, 3D-flyer, and F3A. It is very light. It comes with a 3-pin power and control cable and mounting hardware.

Dimensions: 23 x 12.2 x 28.5mm
Net Weight: 13.8g
Operating Speed (4.8V no load): 0.10sec / 60 degrees
Operating Speed (6.0V no load): 0.08sec / 60 degrees
Stall Torque (4.8V): 1.8 kg/cm
Stall Torque (6.0V): 2.0 kg/cm
Temperature Range: 0 to + 55 degree C
Dead Band Width: 10us
Operation Voltage: 4.8 - 6.0 Volts
Recommend Model: Mini Car / Mini Ship / Helicopter & Airplane

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