yeah, i most certainly don't want nickel metal in contact with my skin, even if only just my hair, what an awful choice of material... chrome is more neutral to sweat
really what you'd want is it has little springy pins on one side that actually anchor the induced current to your skin
the main point of all this really would be, if it had a point, soaking up the frequencies and mushing it together in a small, safe DC current
overall, earthing is probably more effective, just a copper plug in your shoes that earths you, then your skin acts as a shield, conducting the radiation electrons quickly into current and getting it away from you
also, just on the last point, it's not about neuroelectric signal induction, although that may at some point matter, but probably not without an implant into your brain - it's about the moderate ionising effects of especially microwave bands like 20 and 80ghz, and more generally, the clouding of sensing of schumann resonance diurnal oscillation timing and its effect on endocrine clocks
Cave man not know what you talk about. Cave man just walk on grass.