“Pink Crystal Nail File” has a medium grinding surface that has been produced using an exclusive chemical process making this file gentle on nails. There is a lifetime warranty on the grinding surface. Easy to clean using a soft brush and warm water. You can file nails in both directions without causing nails to shred. Prolonged use can prevent splitting of nails. Excellent for both acrylic and natural nails. Comes with a handy travel friendly case. Small enough to put in an evening bag…big enough to keep all 10 of those nails in top shape!