The micro pedi replacement rollers remove hard and rough skin on the soles toes and heels of the feet this is only to be used with the specific device item details the micro mineral rollers spin 360 at 30 times per second smoothing and buffing away hard and dry skin effortlessly to reveal beautifully smooth and soft feet our extra coarse rollers come with the new flex technology which allows the rollers to flex with the foot which gives you an all over smooth look and feel consult your