AndreD, so far I have only been using some Uni wire in size small, it is sort of mustard yellow in color. I only have a bit more of it and I'm not really sure why I got it because the color is strange. It seems to almost totally disappear in the brush materials spun up. I have some other colors in the small size and a few colors in the brassie size (I think that is the next size larger). I also have some craft store wire, some of it is brassie sized or larger. Is that a good type to use or should I be using something else. I think this stuff is fine enough to work with yet not add a tremendous amount of weight to a fly.