These are 9"(23cm) long jumper wires terminated as female to female. Use these to connect from any male header on any board . Multiple jumpers can be connected next to one another on a 0.1" header. Comes in one pack of ten jumpers (colors may vary).
They work great with breadboards, Arduino, and really any 0.1" pitch prototyping board. If you are starting with Arduino, jumper wires are sure to come handy at some point. They are great for rapid prototyping, and always a good resource for wiring and testing.