Just sayin .
i believe the term is "powder coated", matte black, which was done professionally. It was $160 per wheel.I assume the wheels were plasti/hyper dipped? I did the same on my 2017 and it looks great. I left the center bowties blacked out though, mainly because I wasn't confident enough to try and peel off just that portion. Is that what you did?
It doesn't hurt that the wheelwork draws comparisons with Teslas, but I did it to reduce total amount of chromey-ness. I like some chrome, just feel that a little on the trim goes a long way. Blacked out some of the front bumper area as well.