Tinksky 10pcs 20cm Male to Male Quadcopter Servo Extension Lead Wires for Futaba JR Receiver Material: durable hard plastic and copper wire. Cable length: about 20cm.Connectors: Male to Male connectors. Specially made for connecting quadcopter controller board to receiver (Compatible with JR and Futaba receiver). For connecting auto pilot cards and stabilization systems. Simple and practical design, easy to use.