The Scholl Velvet Smooth with Diamond Crystals Extra Coarse Electronic Foot File has finely ground diamond particles which can give you soft, smooth feet in no time at all. The extra coarse roller head is suited for removing tough, hard skin. The Scholl Velvet Smooth with Diamond Crystals Extra Coarse Electronic Foot File buffs away hard skin in minutes leaving you with feet that you'll want to show off. It has an ergonomically shaped head for comfortable use. The Micralumina roller head makes it quick & easy to remove tough, hard skin by using a gentle & safe rotating action. Remember â skin on your feet is thicker than on the rest of your body so you really do need that something ideal for your feet. Getting Ready to Use your Scholl Velvet Smooth with Diamond Crystals Extra Coarse Electronic Foot File: Insert the roller into the device making sure that it is fully engaged. Operation: Move the unit in regular passes over the dry, hard skin applying light to medium pressure. There's an integrated safety stop, so rest assured there's no danger of applying too much pressure. Use: Continue with regular passes until the hard skin is removed & your feet are left feeling silky soft. Do not use in the same area for more than 3-4 seconds at a time. Stop if the skin becomes irritated or you feel discomfort. Care: Wipe or rinse feet to remove any excess hard skin & thoroughly dry feet. Finish by applying a foot lotion or cream to your feet such as Scholl Velvet Smooth Essential Moisture Cream (or Velvet Smooth Intense Serum).