The "roll" should not be used if I'm reading that page right. The one I think you a referring to is a hard grind stone. Here are some quick links to show some of the suitable types of wheels for sanding, you can also use the sandpaper disks on a mandrel but each style has it's own use. I quite like the Scotch type wheels but sometimes you need something more aggressive and sometimes not. Hard stones really won't work well with razors.

The links are not suggested sites to purchase from, nor do they necessarily show the best type of each style, I just used them for illustrations purposes.

Scotch-Brite type abrasive wheels


Bristle wheels


Sanding drums

Regards

Christian