1.GENTLY REMOVES ROUGH SKIN Better than metal scrubbers and skin shavers, doesnt hurt your feet. with two different grit surfaces and with a knotted string for handling. 2.HEALTHY HEELS AND NAILS- Gentle surface allows for easy, smooth, and most importantly, safe care of your feet without damaging the sensitive skin. It may be used with toenails too and will not chip, tear, or split nails. Professional pedicure with no extra costs. 3.TAKE IT ANYWHERE Use it whenever and wherever you want. Use it in a bath or in a chair, at home or while travelling. No batteries or spares - just wash it, dry with a towel and use it again. Protective case provides protection for each nail file, very easy to store, and carry with you. 4.PREMIUM QUALITY - Crystal glass callus remover foot rasp is dual sided and made of premium quality Czech crystal glass. The grit board is permanently chemically etched (acid engraving) on both sides of the glass, so it will not degrade over time and will a lifetime. 5.LIFETIME GUARANTEE - Effective filing surface allows for precision shaping. Each file comes with a lifetime guarantee which covers the filing surface. All glass callus remover foot rasp we sell are chemically hardened which greatly increases their mechanical resistance.