This is the Savox SC-1232SG Lightning Speed 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 1/8th 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):  .15
Torque(@4.8V oz-in):  250.0
Speed(@6.0V sec/60):  .13
Torque(@6.0V oz-in):  305.5
Gear:  Unique Steel
Bearing:  2BB
Case:  Full Aluminum
25 Tooth Spline