This is the Savox SH-0257MG 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 CCPM and Rudder on 450 class heli's and park flyer airplanes.

The Savox SH-0257MG metal-gear, high-torque, digital, micro servo has more output torque than larger servos without sacrificing speed.

Features:

• Metal gear train ensures durability and longevity.
• Aluminum middle case allows for cooler operating temperatures.
• Ideal for small planes, and 450 size helicopters.

Specifications:

• Torque @ 4.8v - 1.8kg/25.0oz-in
• Torque @ 6v - 2.2kg/30.6oz-in
• Speed @ 4.8v - 0.13 sec/60 deg
• Speed @ 6v - 0.09 sec/60 deg
• Dimensions L x W x H (mm):22.8 x 12.0 x 25.4
• Weight: 14.0g