Handy for making wire harnesses or jumpering between headers on PCB's. These jumper wires are 200mm long and come in a 'strip' of 40 (4 pieces of each of ten colors). They have 0.1" sockets on either end and fit cleanly next to each other on standard-pitch 0.1" (2.54mm) header. We recentlty updated these so they are in a 'ribbon strip' instead of individual wires. You can always pull the ribbon wires off to make individual jumpers, or keep them together to make neatly organized wire harnesses.
We suggest picking up some extra-long break-away header pins (like this) as well, you can stick those into the sockets to turn the cables into female-male or male-female jumpers!
For best results, when plugging these in a line, have the sides with the 'silver latch bit' sticking out since that side is a tiny bit wider than 0.1"
