hi bill, a few years ago i took a class from james binion. he has written an excellent text about the process on our own 'tips form the jewlers bench'. he uses the stainless(?) steel tool wrap.
James Binion has a description of the mokume process on the web
at the ArtMetal site. This is the url for the page;
If you haven’t been to the site before you might follow the
links on the bottom of the page. Lots of interesting info.