Smooth unruly calluses and buff away hard skin with the micro pedi extreme coarse rollers revolutionary in the pedicure world these strong coarse rollers are specially designed to combat even the roughest skin gliding over isolated areas to rid the surface of stubborn hard or cracked patches without risk of abrasion made up of micro fine materials that wont irritate the unique rollers spin 30 times a second with a 360 motion to gently but effectively buff away unwanted hard dry skin