This 20-pack of callus foot shaver blades provide premium quality, double-sided blades that fit most brands of callus shavers for replacement as needed. Made of laminated steel to prevent rusting How to change callus shaver blades: Lay shaver on a hard, flat surface. While securely holding sides of blade holder, push handle forward. Lift handle. Without touching razor, turn blade holder over so that blade drops from holder. Insert new callus foot shaver blade. While holding sides of blade holder, reposition handle and pull towards you. Caution: Blades are very sharp. Please handle with care. Do not clean blades - replace when blade becomes dull. Keep out of reach of children.