This is the Savox SA-2272SG Lightning Speed Brushless Steel Gear Digital Servo.

Features:

Combines leading edge technology with super high 12 bit (4096) resolution and unique steel gears.
Super light-weight.
Brushless motor provides extremely high speed, incredible efficiency, and amazingly low power consumption.
Extremely strong unique steel gears ensure long-life and durability.
The full aluminum case design not only looks good but also allows for cooler and smoother operating temps.
Our servos are totally green – from materials to production, these servos are environmentally friendly.
Ideal for 1/8th or 1/10th scale trucks and buggies, every control surface for giant scale aircraft, and 700 class heli rudder.

Dimensions(mm): 40.3x20.2x38.5
Weight(g): 66.0
Speed(@4.8V sec/60): .055
Torque(@4.8V oz-in): 41.7
Speed(@6.0V sec/60): .045
Torque(@6.0V oz-in): 69.4
Speed(@7.4V sec/60): .032
Torque(@7.4V oz-in): 97.2
Gear: Metal
Bearing: 2BB
Case: Full Aluminum
25 Tooth Spline