These high quality, double-sided replacement blades fit most brands of Callus Shaver. Necessities for a hygienic pedi. These high quality, double-sided replacement blades fit all brands of Callus Shavers. 20 blades per box so you always have extra blades on hand. Made of laminated steel to prevent rusting. How to change blade: 1. Lay shaver on flat hard surface. 2. While securely holding sides of blade holder, push handle forward. 3. Lift handle. Without touching razor, turn blade holder over so that blade drops from holder. 4. Insert new blade. While holding sides of blade holder, reposition handle and pull towards you. Warning: Blades are very sharp. Handle with extreme caution and avoid handling blades razor edges. To prevent cross contamination, do not use same Callus Shaver Blades on more than one individual. Always clean your Callus Shaver after use according to instructions. Replace blades when worn. No. 5000-P