I have looked at a new Hardy cc de France 7 foot 2 pice 4 wt rod and it is gorgeous of course. There are a series of narrow winding bands (red thread) equally spaced along the length of the rod. These look perfect and also looks to me like it must have taken a lot of work to do this. I know the original CC de France was a 30's design. Are these windings cosmetic or structural? Is it a mark particular to Hardy or this particular rod perhaps? Or a tradition in bamboo rod building? I don't know boo about boo, so hope that someone here familiar with this rod and it's history can fill me in.

Thanks
Rich