This is the SH-1257MG Mini Digital Metal Gear Ultra High Speed Servo.
Features:
- Extremely fast with 0.07 sec/60°transit speed
- Extraordinarily light in weight, 20% lighter than servos with similar specs
- Coreless Motor provides high speed, incredible efficiency, and low power consumption
- The Aluminum Case design not only looks good but also allows for lower operating temperatures.
- Totally Green – from materials to production, these servos are environmentally friendly.
- Ideal as a tail servo on the 250, 450, 500 Size helis