MICRO DIGITAL MG SERVO .09/30 @ 6V 
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.