If you suffer from weak fingers and strengthening exercises aren't cutting it, this is the product for you. In all seriousness I have struggled with pulling a book out of a tightly packed shelf only to break off nails that I don't even really have. It can be painful. Furthermore the battle manages to delay my mind from the entertainment and knowledge it so desperately needs. What I could have done with those valuable seconds that were lost in the fight!
As far as I know this site is the only place to find it. If you read Japanese (who doesn't?) you're set.