cured powder finish
https://kilo-wiki.win/index.php/How_Wheel_Powder_Coating_Outperforms_Paint_for_Car_and_Motorcycle_Rims
The cured powder finish on this metal surface has a smooth, even texture that feels almost like ceramic, with a subtle matte sheen that doesn't show fingerprints. It's surprisingly durable; I accidentally scraped it with a key and it didn't leave a mark, just a faint white line that wiped right off. The color has held up well too, even after months of daily use.