They call them penny tiles, they’re about 0.75” in diameter, about .24” tall. Not sure what I’m going to do with them but I’ll think of something. I better, because they come as a sheet of 240 tiles!
Engraved and very quickly sharpied.
They aren’t smooth enameled, they have a little texture to them. Despite that, they clean up pretty well.
Update: There’s a whole line of these, I had no idea. This includes a high gloss version which would probably clean up a little more easily.