For the colour blind?
this is cheaper than colored ribbon cable and easier to make. the marking is just an ink squirter.
note that this cable is NOT 2.54mm pitch ! it is not for double row idc connectors but for those single line crimp connectors like JST PH XH and likes. It is a 2mm pitch.
this is used to make harnesses. you split off the wires one end can have a 16 pin and a 4 pin and the other side a bunch of 3 pins , 4 pins or whatever. they are commonly used in TV and audiovisual equipment to interconnect circuit boards.
i want to use them in a 3d printer. i have a large 20 pin on one side and then a bunch of 2 3 4and 5 pins on the other end going to various elements. the striping makes it easy to keep follow the wires...