Beter Feet& Roll Electronic File Callous Remover is An revolutionary instrument with a Special Roller sleeve made of microparticles called "quartz powder" to soften rough, chipped skin gently and efficiently. Built for the feet and the heels as a smoothing coarse skin. It is specially designed for feet and heels and cannot be tried on other areas of the body. Easy to charge device that lasts for a long time, effective and completely safe for smoothing rough skin. The best product for removing dead skin from the heels