With the problem of massive cornea in Fussohlen- u. Toe ball area faced for some time, I was working so far with a rasp of metal. This was / is optimal only useful directly after bathing, because the skin is softer then. After receipt of this Zwillingsraspel, as always super fast through Amazon, I tried the effect immediately, and - am absolutely thrilled! The lower surface (rough surface) fits, thanks to the slight concave curvature awarded to natural forms and grates easily and effectively with little effort. With the top then the fine finishing; Your skin will thank with distinct smoothness, reaches gently! Use best for dry skin! Simple cleaning (water) a total of excellent product!