This is the Savox SA-1230SG Monster Torque 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 giant scale aircraft, monster truck, 1/8 scale.

Dimensions(mm): 40.3x20.2x45.0

Weight(g): 79.0

Speed(@4.8V sec/60): .20

Torque(@4.8V oz-in): 417.0

Speed(@6.0V sec/60): .16

Torque(@6.0V oz-in): 500

Gear: Unique Steel

Bearing: 2BB

Case: Full Aluminum

25 Tooth Spline