While they are not the most fascinating product, the Maker Shed’s new jumper wires are really handy for prototyping. The female to female version is perfect if you need to attach a male pin to another male pin and is great for making extensions with regular jumper wires.  The male to female version also works as an extension but lets you plug sensors, modules, and individual components directly into female headers or into a breadboard. Every electronic tinkerer needs a set of these in their arsenal! They are also available in a bundle containing both versions.