These things are amazing when you need to jump male header pins to a protoboard or breadboard. Used them for our senior design project to prototype and it allowed for things to be organized by using the different colors for different peripherals. Pretty handy when you are using a 208 pin micro controller and the pins for the ports are spread out everywhere. Downside is they are a bit expensive, but all of these type of wires I have purchased from sparkfun are really nice.