I hold them in my hand and find it uncomfortable after a while because I can't move them around. It kinda helps me concentrate on honing, though.

On a different note, I contacted the customer service of the people who make the gray ones and they said the course one is 120 grit and the fine one is 900. This is somewhat confusing to me because the edge they put on the razor is so much smoother than the grits of the dmts. And I can go to the shapton without any problem. So, I take a closer look at all my hones to start researching and figuring out what the grits could be, and I'll be danged if the orange india stone isn't a norton. I couldn't tell what the label on it said until I really got a better look at it. It had another hone attached to the other side at one point in time. It was dark in color - gray or black. Looking at norton's site, it's a bit harder than the waterstones. knifecenter says norton impregnates their oilstones with oil before they ship them out? I'm still looking for the grit of it.