Newest Ergonomics design: U-shape curve design is an ergonomics design which fits the bottom of feet and heels perfectly, giving you a comfortable experience of removing foot calluses.- Two diverse sides: A concave curved design on the front, with coarse sand, fits perfectly to remove the thick calluses on the heels and the edge of the foot. The back design presents a convex curve, with fine sand, perfect to fit the soles of the feet while suitable for removing the soft dead skin there.- Professional product size: Working surface is a larger touch surface which can work on a larger surface at one time, giving you delicate skin, high-efficiency and save your time.- Work well in Dry or Wet : It gives equally good results on both dry and wet foot surfaces that allows the user to work according to their own preference and satisfaction.- Easy to hold and storage: The handle is made by high quality PP material, durable and easy to hold. A rope is attached to the end of the handle, easy to storage and space-saving.- Suitable for all kinds of people: Especially for high-heel addicts, elderly people, sport enthusiasts, teachers, waiter and so on.