This is the Savox SC-0251 High Torque Metal Gear Digital Servo.

Features:

    Precision metal gears form a strong and solid framework
    Strict production and quality control of plastic components ensures high performance
    Our servos are totally green – from materials to production, these servos are environmentally friendly.
    This high torque servo is great for crawlers, 1/8 scale vehicles and 50 class airplanes.

Dimensions(mm): 40.7X19.6X42.4
Weight(g): 61.0
Speed(@4.8V sec/60): .20
Torque(@4.8V oz-in): 180.5
Speed(@6.0V sec/60): .18
Torque(@6.0V oz-in): 222.2
Gear: Metal
Bearing: 2BB
Case: Plastic
25 Tooth Spline
Frequency: 200-250hz
Pulse Width Frequency: 1520
Running current (at no load): 300mA @ 4.8V
Running current (at no load): 350mA @ 6.0V
Stall current (at locked): 2600 mA
Stall current (at locked): 3200 mA
Idle current (at stopped): 5 mA
Idle current (at stopped): 6 mA
Limit angle: 180° ± 10°
Connector wire gauge: #22 AWG
Connector wire length: 150 ± 5 mm
Horn gear spline: 25T
Control system: Pulse width modification
Amplifier type: Digital controller
Operating Travel: 120° (when1000?2000 µsec)
Neutral position: 1500 µsec
Dead band width: 5 µsec
Rotating direction: Counterclockwise (when1500?2000 µsec)
Pulse width range: 800?2200 µsec
Maximum travel: Approx 165°(when800?2200 µsec)
Frequency: 200-250hz
Pulse Width Frequency: 1520