Review title is replacement filing discs [SEP] I purchased the tool for my 80 year old mom because she like to file her own toes and fingers.  This tool makes it so she can.  The thing I don't like?  That you have to purchase ALL four files - the buffing files (2 of the 4) are useless.  So - it would be nice to be able just to purchase the green and blue ones.  The buffing files just go into the trash.