it is two strands of a 22 gauge wire....I put one end in a pair of hemostats, the other end with my bent angle tweezers, and spin the hemostats.
Here is what the strand looks like:
That's a 20 oz bottle cap for reference...
I cut them for various lengths, etc. For the antennae on this kit, I took three strands and then spun them. On 1/35 scale armor, four strands loosely spun looks remarkably similar to the weld seams on stuff... I usually get three or four feet of different gauges. 18 gauge wire would have been fine with just a single strand, but I ran out, and spinning the smaller stuff gives it better strength and less chance of being bent.