These Jumper Wires are very handy for making wire harnesses or jumpering between headers on PCB's. These jumper wires come in a 'strip of 40 (4 pieces of each of ten colors). The sockets on either end have 0.1" spacing end and fit cleanly next to each other on standard-pitch 0.1" (2.54mm) header. They are in a 'ribbon strip' instead of individual wires and can always be pulled to make individual jumpers, or keep them together to make neatly organized wire harnesses.
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"