The black ones I have, I just took off the other day. And around where they tighten to the rim, the black is peeled off. It's chrome lol.
lol x2 here as well. bought from autozone, i think they are Dorman brand. I now take a piece of thinn cloth and stick in the socket so it doesnt peel away the black.

i really like them though. they sit in a little deeper and are thinner. gives a better look over the lug nut covers.