Gunmetal grey: A darker grey than the OEM silver. The naming of this color is all over the place, I think: charcoal, titanium (??), etc.

This finish by Champion pictured here is matte in appearance. It is beautiful in person. It is much better IMHO than if you have your wheels painted Allas Silver by Porsche, as the latter is shiny and just doesn't look right, at least to me.