This is the Savox SV-0235MG Super Torque Steel Gear Digital Servo.

Features:

    Combines leading edge technology with super high 12 bit (4096) resolution and unique steel gears.
    Super light-weight.
    High speed, incredible efficiency, and low power consumption.
    Extremely strong metal 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 5th scale vehicles

Dimensions(mm): 65.8x30x57.4
Weight(g): 200
Speed(@6.0V sec/60): .16
Torque(@6.0V oz-in): 388.8
Speed(@7.4V sec/60): .13
Torque(@7.4V oz-in): 486.1
Gear: Metal
Bearing: 2BB
Case: Full Aluminum