These are 10cm long jumper wires with male connectors on both ends. Great for connecting jumpers from any female header on any board, to any other female header. Comes in one pack of 40 jumpers (colors shown). Each group of jumpers are connected to each other and can either be pulled apart in any quantity (from 1-20, of course) or kept whole based on you needs.
These jumpers are great for pretty much everything! They are excellent for breadboards, Arduinos, and really any 0.1" pitch prototyping board.