Hubcap material and size?

My dad’s original car came with these hubcaps. Right now his current car has some tires Rally wheels. He wants what he had.

I have a set of 4 that are B grade. The centers are made of pot metal or something similar. They are pitted and will need repaired. What is the rest of the hub cap made of? I’m guessing stainless or “chromed all over but only polished outside” steel.

I also assume these are 14”?