So the product is absolutely great !!! Unbeatable for the price. I really have problems with the cornea on my feet. All the files have my feet always hurt and it has mainly used for ages until you really have seen success. This Callus it's really easy. Initially, the unit has felt a little weird in his hand, but because it is like a different motion of normal electrical appliances. But you'll quickly in the movement. It works best when you hardly impresses, then the cornea is most distant. After treatment, the feet are just absolutely soft. I had a little afraid that it might cause a lot of pain, but I was wrong - it also does not at all hurt to remove the cornea. In addition, 4 change roles in the unit with it, and a brush. The brush can be removed easily and the dust of the cornea. The 4 wheels are great as well. However, I have can not determine if the roles are different rough, so they fine abhobeln possibly coarse or the cornea. Still, it's super easy spare to have her. I'm really at peace around. That is why this gets Profukt of me 5 stars! :) I'm really excited :)