@Orchidile
They are zinc alloy based with a thin layer of gold plating over top of them. I don't recommend them for sensitive ears just to be on the safe side.
I'd absolutely hate for someone to wear them and then have a bad reaction to them :(
@discreetfrogass
Potentially in the future with more research! Unfortunately for now, no, but I promise many more other ways to add the frog friends into everyone's life!