Handy for making wire harnesses or jumpering between headers on PCB's. These premium jumper wires approximately 6" (150mm) 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. Adafruit recently 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.
Note: The length of the jumper wires varies somewhat, they are approximately 6" but are not always the same exact length, you may find they are longer by up to 1-2"
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"
Each wire is 28 AWG (7 strands @ 36 AWG)