We use a large diameter material for the stopper. It is a slightly rough finish that makes use of line carving.
After first wiping lacquer, rust mixed with lacquer and whetstone powder is wiped in.
After that, I wipe the lacquer again.
The extra-large size looks great at parties, but I think it's too big for everyday use.
It's only 50mm larger than the large (diameter 400), but it feels quite large.