This is the Savox SH-0262MG Super Speed Metal Gear Micro Digital Servo.

Features:

Over-spec refined design out performs ordinary micro size servo.
The metal case design looks awesome and allows for cooler and smoother operating temps.
Metal gears form a solid framework for precise control and operation.
Strict production and quality control of plastic components.
Our servos are totally green – from materials to production, these servos are environmentally friendly.
Ideal for tail servo for 250/450 class heli's and park flyer airplanes.

Dimensions(mm): 22.8X12.0X25.4
Weight(g): 13.6
Speed(@4.8V sec/60): .08
Torque(@4.8V oz-in): 11.1
Speed(@6.0V sec/60): .06
Torque(@6.0V oz-in): 16.7
Gear: Metal
Bearing: 1BB
Case: Aluminum
21 Tooth Spline