To better understand the files, here are some tips! The blue borders correspond to soft files with a grain of 180/180 for the preparation of natural nails. The files with the green border are medium files with a grain of 150/150 designed for shaping the gel. The files with the pink border are hard files with a grain of 100/100 for shaping the resin and filling. Finally, the extra hard files are the black border files which have a grain of 80/80 and which allow the material to be removed. All Beauty Nails files and polishers are on Beauty Coiffure.