These are 2 pcs of Revox Pro Servo Extension 22AWG Cable Wire 50Cm with Futaba J Connectors. This extension goes between the receiver and the servo to make the wire longer. On one end of the wire is a male "J" connector and on the other end of the wire is a female "J" connector. Wire Gauge: 22AWG Wire Color Codes: Black: Negative Red: Positive White: Signal (polarity tab is on the signal side)