Looks ok to me, you are building an IC correct? You need three of the same length depending on your desired length. You also have to account for the fact that you will be braiding your wires. Some headfiers also add a sleeve on top but is not needed, it is mainly for esthetics.
Search the net for braiding techniques, there are loads of references. In the case of an IC, it being stiff usually helps but for headphone re-cabling I'd go for flexibility. To me, if the wire does not come back to its original shape than I am not too happy about it. However I also want it flexible so I can coil it back in an earphone storage bag if IEMS. That's just me and that is mainly for headphones and IEMS re-cabling.
Thanks a lot, I am missing a couple of words in english sometimes. In my native I could order everything I need (I have a fair amount of electronic and electrical engineering experience) but for example I couldn't remember that its called "braiding" :)