Pana Jumbo Nail Files Has A 100/180 Grit Size Which Is 100 Grit Is The Most Common File To Use When Shaping And Shortening Acrylic Nails. Although It Is Best To Use On Acrylic Nails, 100 Grit Files May Be Used On Natural Nails (Depending On The Nails Thickness). This File Can Work From Softening Rough Edges To Rescuing A Product Application Thats Gone Wrong. It Is Designed To Have A Double-Sided Nail File 100 Grit Size For Work In A Single Direction From The Outside Edge To The Center Of The Nail To Help Prevent Splitting. Since This Piece Is So Versatile, You Can Use It Vigorously Or Gently To File The Nail To Any Curve And Tip You Desire. Pana Jumbo Nail Files Is Made With A High Graded Emery Paper And Glued Together Making Them Both Abrasive And Flexible. It Is Commonly Used For Fingernail And Toenail Care. It Can Also Buffer File To Smooth The Edges And Fix Small Uneven Or Rough Areas. Pana Jumbo Nail Files Are Disposable And Cannot Be Sanitized. They Should Be Disposed After Every Usage. Suitable For Personal And Professional Nail Enthusiasts.