This is a nice inexpensive pumice stone. I just keep it in my shower and use it when my feet are feeling a little rough. And then smooth them out once I get out with the electric pedi foot file. It has lasted years. Definitely worth having around.
I adore this stone. I always get one dry rough patch on the side of my foot and this takes it away. I also get small calluses on the hands from work and boom a couple quick fast rubs with this and I'm all smooth again. Love it.