Pack of 8 Emjoi Micro-Pedi Refill Rollers are compatible with all Emjoi Micro Pedi models. Best all-round roller for callused feet. Great for rough calluses, keep the skin soft and smooth. Suitable for Both Men and Women, all skin types. Unique wheel micro mineral particles, more effective and easier to use than metal scrapers and a pumice stone. Directions: Glide the roller over the callus/hard skin area for 2-3 seconds. Do not press hard.Check results and continue to use for 2-3 seconds until the desired level of smoothness is obtained. *Not for Dr. Scholls*