This 60cm servo extension cable has three 22-AWG wires joining a male Futaba J connector and a female JR connector. Since a female JR connector can be plugged into a male Futaba J connector, each end of the cable is compatible with both Futaba and JR-style connections; this cable will work as an extension cable in either system or as an adapter between systems, and it is compatible with almost all of the servos we sell (you can assume our servos have female JR connectors unless the servo’s product page specifically says otherwise).