(The following discussion has been moved from the article page:)

Tom: I am curious, what is the most desirable thickness for stones? I don't want to purchase any too thick, but of course not too thin. I guess its a matter of personal taste, but does anyone have any preferences? Its hard to find a place to test different sizes.

Zarlan: Well, I have a 8mm set and a 9mm set, and personaly I prefer 9mm or maybe stones that are slightly, but not all that much, bigger. 8mm isn't bad though, but smaller stones probably would be.

pwaldron: For what it's worth, I had the chance to compare once and found my preference to be for 9.2 mm stones. They are large enough to give a feeling of substance, but any larger and the stones wobble around too much on the board.