I bought Dr. Scholl foot file about 5 years ago from a CVS pharmacy store. I think it has lasted long.
I use this foot file almost regularly.
Good for removing very rough skin.
The two surfaces coarse and smooth is very good.
I would use the coarse side
to remove the very rough skin and then use the fine side to make the skin more smooth. Using this foot file after saoking your feet for few minutes in water(warm water) makes scrubbing more easIer.
A good foot file for anyone who wants to maintain the beauty ...