This is a Aileron Servo Extension with Futaba J Connectors.
This extension goes between the receiver and the aileron servo to make the wire
longer. On one end of the wire is a male "J" connector, the other end is a
female "J" connector.
One 39" (1-meter) Long Aileron Servo Extension w/ J Connectors
– If you need more information, use these Futaba resources –