ELEGOO 130pcs Solderless Flexible Breadboard Jumper Wires Male to Male for Arduino Breadboard Material:copper-clad steel,PVC,Goodconductivity,can be used repeatedly. The head of the cables is stronger, not easy to fall. Different size wire: 4.72 inch,6.29 inch,7.87 inch,9.84 inch,many kinds of colors and sizes can do all kinds of circuit experiments. Packing in a color box We have always cared about the customer experience and improve the product function details.