I painted my chrome ones with VHT paint. I matches pretty close to the frame and engine color. I've had no issues with the paint coming off. There are some that have used plasti-dip on them, but I think most have experienced scuffing on the shifter side
If you want metal, and something etched on them, MD-Customznw
did up a few for a couple people onsite here and may have some left from the run they did. It's a bit more expensive than painting, so that's why I went that route, instead of a billet cover. I'd love a custom etched one. The only one really visible on my bike is on the shifter side.