A Good Foot File Can Work Wonders On Your Feet And Tackle Some Of The Biggest Rough Spots And Calluses You Get. But A Bad Foot File Can Actually Harm Your Feet, Taking Off Too Much Skin, Or Not Being Tough Enough To Get Through The Hard, Dried Skin. The Reasons You Will Love Our Nano Technology Glass Foot Rasps: ? Made From Hygienic Non-Porous Glass That Is Easy To Clean & Reuse, Simply Rinse Under Running Water.Suitable For Dry And Wet Feet, Men And Women. ? Twice-Tempered Glass Is Hard-Wearing And Built To Last. Glass Files Do Not Corrode, Rust Or Rot Like Typical Files, This Is A Gentle Foot Care Tool Designed For Regular, Long-Term Use. ? Easy And Comfortable To Use, Gently Scrape Off Hard Skin & Calluses On The Heel And Sole Of The Foot With A Gentle Backwards And Forwards Motion. ? Portable For Travel Use. Say Goodbye To Cracked Heels And Nasty Calluses, You Can Take The Socks Off & Show Off Your Beautiful, Smooth Feet Always And Everywhere! Foot Care Steps: 1.Start By Soaking Your Feet In Warm Water For 5-10 Minutes To Soften The Thick Callus,Then Dry Your Feet. 2.Grind The Glass File Surface Back And Forth To Your Feet, It Will Help To Remove The Callus And Polish Your Feet. 3.It Is Highly Recommended To Use Foot Cream Afterwards. 4.Please Rinse It Directly With Water Or Soap After Use, It Is Extremely Easy To Clean.