Ultra-Coarse with Diamond Crystals: The roller head is equipped with diamond crystals that help to break down tough, hard skin, providing a professional-level treatment at home. Wet Dry Use: Suitable for both wet and dry conditions, allowing you to use it during a shower or bath for added convenience. Effective Hard Skin Removal: Designed to remove even the toughest hard skin effortlessly, giving you smooth, beautiful feet in just a few minutes. Easy to Replace: The roller head is simple to attach and remove, making it easy to keep your Scholl Velvet Smooth Foot File in top condition.