On the metal thing. I haven't found the exact metal it'll be made of yet. I got my prototypes that are made of material I've found but manufacturing isn't worked out yet. On the other hand, no metal will ever touch your skin when you wear it anyway so I doubt that'll be a problem.
I'm at the moment working on the patent pending. At least getting that much filed for now. A lawyer friend of mine is sending me information on what I should do. He also said he'd help me make sure what I have won't violate any other patent. So I'm lucky to have some help in that area. Getting things patented isn't cheap.
Ron Jaxon
If you are going to use metal: Titanium Grade 1 or 2, Ti-6-4 ELI, 316L stainless, MP35N, some cobalt alloys, and a few others. But if you stick with the first 4, then you have it covered.
C1