Lot of Thin 8" Cut Off Wheels 55-60 in package

Description

This is a large lot of cutoff wheels, 8" in diameter, with a 3/4" bore, and about 0.031"[.078mm] thick.
No idea of the maker, but these have a 7640rpm rating and 220 grit with a rubber bond bond (I think that is the "R" printed on the discs.These came shipped with the duct tape on them and I lost count between 50 and 60. They weigh about 78g each. My understanding of these composition wheels is that they are for thin cutting (like surgical tubing and thin material), which require a good finish.
I don't know anything more about these, except that they came from a grinding operation that did surface and centerless grinding.