I can't believe how fast this took care of a callous under my toe. I tried other stones and nothing worked. It is lava stone and it is easy to use. I have drop foot and can't get to my foot without sitting on my bed with my foot straight out. It was so easy to get to my foot with this tool.
Compared to what my feet were before I started using this to now are like night and day. My feet aren't completely soft yet but I am seeing a podiatrist in a few days. Once my feet are back to how they should be I will touch up when needed with this stone.