Here is the product:

Here is a rather poor photo of that 7 wire strand (.30 mm) (on the right) and a strand of my "invisible" smoke monofilament (on left) and the very thinest strand of copper wire that I have used (in center).

The wire is rather stiff and don't even think of tieing it. The strands do not unravel (haven't even been able to force that).
I am going to try to use it as flying control cable (at least inside).

Regards
Steve