A kit for softer feet + 1 Roller + 1 Cover + 2 AA Batteries Its roller, made of Diamond Crystals (synthetic diamonds), is interchangeable. Its ergonomically designed handle ensures a comfortable grip. For hard and stubborn calluses, use the Scholl Velvet Smooth™ Ultra Exfoliating Grain replacement rollers. Your feet will be soft and beautiful. Transform your feet with the Scholl 2-in-1 Electric Foot File! Take advantage of the diamond surface for effective exfoliation. Order now!