How Does It Work? The Microplane® Foot File uses a variation of the patented Microplane® Grater technology which allows you to zest an orange (skimming off the tough zest) and leaving the soft pith. In a similar (yet gentler) process on your foot, the dead skin comes right off, leaving the baby soft skin below. Why Is This Better Than Other Foot Softening Methods? Other files just rub the skin off. This can either be very time consuming or simply does not work on thicker calluses. Creams takes days and weeks to sink in and do not get rid of the unwanted skin layers. Approx 7 Inches long. Available in four colors; sage green, soft pink, teal blue and butter yellow.