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