This is the Savox SH-0254 High Torque Micro Digital Servo.

Features:

• Over-spec refined design out performs ordinary micro size servo.
• The metal case design looks good and allows for cooler and smoother operating temps.
• The metal gears form a solid framework for precise controls 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 CCPM and Rudder on 450 class heli's and Park Flyer Airplanes.

Dimensions(mm): 22.8X12.0X29.4
Weight(g): 15.8
Speed(@4.8V sec/60): .16
Torque(@4.8V oz-in): 43.1
Speed(@6.0V sec/60): .13
Torque(@6.0V oz-in): 54.2
Gear: Metal & Plastic
Bearing: 1BB
Case: Aluminum
21 Tooth Spline