Nail techs and salon professionals, these Fox Pro O-Files refills are exactly what you need for quality manicures. They're 240 grit files that give you that perfect balance - enough abrasiveness to shape nails quickly but not so harsh that they damage the nail plate. Each refill is 3.9 inches by 0.62 inches, and you get 50 in a pack, which is great value. They're made from premium Japanese paper that lasts well through multiple uses. You can apply the adhesive to one side or both sides depending on your preference. They're state board compliant, so you can use them professionally without worry. The slim profile makes them easy to handle and gives you good control during filing. Much better than cheap files that wear out quickly or don't give consistent results. If you're tired of files that don't hold up or don't give you the smooth finish you want, these professional-grade refills will make your nail services so much better and more efficient.