It's a Global G25 ceramic.

I tend to mostly use a Japanese waterstone (1000), but sometimes do a bit of touch up with the ceramic. I don't use a steel. I also have a diamond "steel" in my drawer if something is really out of wack, but it too agressive for normal use.

Note, the ceramic is OK to keep things under control, but you can't really do any signifiant shapening wth it.

-john