I’ve been using this Bass foot file for at least a dozen years.  Don’t let the lack of reviews on Amazon dissuade you from this product – it’s just been recently added to their marketplace.  Until now – trying to find this foot file was a real drag when mine finally needed replacing (they last for years!) – hardly anyone carried it – well no longer!  It’s here!!!  Yea!  Not kidding – this file makes my feet soooo sssmooove!