This is the Savox SC-1233SG High Speed Coreless Steel Gear Digital Servo.

Features:

Combines leading edge technology with super high 12 bit (4096) resolution and unique steel gears.
Super light-weight.
Coreless motor provides extremely high speed, incredible efficiency, and 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 1/10th scale trucks and buggies and every control surface for giant scale aircraft.

Dimensions(mm): 40.3x20.2x45.0
Weight(g): 79.0
Speed(@4.8V sec/60): .08
Torque(@4.8V oz-in): 138.9
Speed(@6.0V sec/60): .07
Torque(@6.0V oz-in): 180.5
Gear: Unique Steel
Bearing: 2BB
Case: Full Aluminum
25 Tooth Spline