The MasterPlast Corn & Callus Remover is a unique tool designed for the safe and effective removal of the hardened skin over corns and calluses leaving skin feeling soft and smooth. Directions For Use:- 1. Soak feet in warm, soapy water to soften hard skin and prepare. 2. Dry feet thoroughly. 3. Gently glide shaver across the corn or callus to remove thin layers of hard, dead skin.