Sounds like one that Tormach recommended a while back. It looks like it is a Norton JB74, 4-in OD x 1-1/2-in tall and different grits on each face. Forgot where I got mine, but Zoro sells them for $40 and it looks like McMaster-Carr sells the same thing for $22:
McMaster-Carr
Mine seems to work pretty well for taking burrs and bumps of the table.
Mike
Before buying from MMC, call and ask if that product is the Norton JB74. They don't like to call out manufacturer's names in the catalog but will supply detailed specs on request.