I see a lot of reference to barber hones around here but not sure what to look for. When someone refers to hones(Norton4K/8K for example) I understand the grit values. Now when you say barber hone I understand it is a much smoother stone, but are there different values or are the "carborundums" and "old swatys" on eBay what a guy should be looking for?

Thanks in advance