CHENBO(TM) 140pcs U Shape Solderless Breadboard Jumper Cable Wire Kit Box DIY Shield For Arduino Conductor Material: Copper Insulation Material: PVC Use these to jumper between any female headers or between two points on the breadboard. Including length: 2,5,7,10,12,15,17,20,22,25,50,75,100,125mm Wires are flexible, durable, reusable, easy to trace, easy to connect and disconnect