I don't think they're quite the same material as the blocks: they seem firmer and a little more crumbly. Still, they do a much better job of erasing than your average pencil topper. I keep a lot of full sized eraser blocks around, but there are times when it's nice to have one right at hand. I added one to the Ticonderoga currently living on my music stand. They're a bit odd looking...remind me of clunky looking nurse shoes. But they do the trick right well!
Now if the fashion police will just leave the little guy alone...

