This is done in a byzantine pattern using 22ga 5/64" titanium links. This has 912 links, two of which are 20ga links to make the clasp work better. It is about 22 and a half inches long.
This is my second try with magnetic clasps. The first set of magnetic clasps were utterly horrible, but this one is quality. I did have to re-glue one magnet once, but It has been fine since then. I made this a number of weeks ago, and hadn't gotten around to posting.