This servo is using for some airplane which using 2 servo for elevator also Flap.

While use 2 same direction sevos, the movement of the elevator/flap would be one side up and one side down as aileron.

This reverse direction servo is able to solve this problem as using one normal direction with one this reverse direction servo.

Parameter:
1.4kg.em(4.8V)
0.12sec/60
9g
wire length: 30CM