I've been using these for a couple of years now, for holding wound-up cables together, as well as holding XLR cables to mic boompoles. And very good they are, too.
Another reviewer here had noticed that the cable-tie often slipped off the end after the cable had been unwound, and that is what I had always noticed. UNTIL, that is, I recently noticed the little graphic "Cable Tie. How to use?"
At first, this graphic did not make much sense to me, until I realised that it represented how to attach the cable-tie to ONE END of the unwound cable only, so that it always stays fixed to that end of the cable, and a long tail of the cable tie is then available for holding the rest of the cable after it has been wound up.
This was a revelation to me, and has made the job of managing the cables and their cable ties much easier. So, attaching the cable-tie near to the cable end for the first time is a really fiddly job, but once it's attached, it can be pulled tight enough that it stays there, and leaves the rest of the cable-tie ready for use when the cable is wound up again.
If I have one gripe about the cable-tie, it's that the very end of the tie should ideally have a couple of millimeters free of velcro hooks, to make it easier to lift that end when it's time to uncoil the cable. I usually subject the hooks at the very end of each cable to a short burst of heat from a soldering iron set to very low heat to achieve this.