The Nickel Foot File is a premium quality, double-sided file that immediately reduces calluses & corns to powder for instant results. Use it in any direction without any damage to your skin; it painlessly softens rough, call used feet. The surface doesnu2019t oxidize or rust. Other attributes include an antimicrobial surface that is easy to clean & the lightweight, easy-to-use grip handle doesnu2019t slip out of your hands.