This is the Savox SC-0352 Standard Size Digital Servo.

Features:

Strict production and quality control of plastic components ensures long life and reliability
Our servos are totally green – from materials to production, these servos are environmentally friendly.
Ideal for 30 size airplane applications.

Dimensions(mm): 40.7X20.2X39.4
Weight(g): 42.0
Speed(@4.8V sec/60): .16
Torque(@4.8V oz-in): 58.3
Speed(@6.0V sec/60): .13
Torque(@6.0V oz-in): 90.3
Gear: Industrial Plastic
Bearing: 2BB
Case: Plastic
25 Tooth Spline