Don’t know, I bought the car with these caliper covers on them which I always disliked but since I am starting to accept them for now, although I usually spray the calipers. Probably do that the next brake pad change.
Selling my mother's Tracker, I removed the calipers and brackets (and drums), sealed all openings, sandblasted them, then painted them gray to blend in nicely rather than have them stand out. I plan to do the same with my Sky as part of its next brake job. I prefer the natural look, just my taste.
This job included restoring the wheels. Mom's Tracker had only 20,000 miles on it, but looked like 200,000. It was a classic example of what Chicago winters do to a vehicle parked on the street from lots of salt on a school bus route.
Before
Parts Sandblasted
Painted
Completed
WipeNew on the plastic also helped make it show well.
Here was a Solstice I did as well.
I like the subtle look. Red calipers would look great if the car was also red. Just my taste.