I've only used this once on my FOOT! And YES - I know I have to be REALLY careful but seems to me that this is just about the same thing that the podiatrist uses to trim the callus between my toe (no $40 co-pay). If you do this, use**  CAUTION, CAUTION, CAUTION **!! Other than that, I can't wait to use the set for arts & craft projects (after cleaning, of course!). :)