BTYMS Nail Files Mixed Grits Set, makes filing your nails easier and less time consuming Nail Files are made with top quality sandpaper, ECO sponges and strong emery board materialsSuitable for different kinds and sizes nail tips, shape the nails to your desired length and shapeThe edges do not cut the skin and they are comfortable holding while filing your nailsWorks great with acrylic, poly gel, hard gel and dip power nailsIf your cats/dogs have issues with nail trimmings these nail grooming files will workGreat for filing nails before nail treatment & nail extensionBeautiful leaf prints on the acrylic files, Ideal gift for your friends and families on Valentine's Day/Birthday/ /Mother's Day/Christmas/Halloween, ect Nail Files Grit Guide-The smaller the grit number, the coarser it is. 100 Grit Coarse grit, ideal for shaping acrylic and taking the length or surface down quickly. 120 Grit Coarse grit, ideal for shaping acrylic and taking the length or surface down quickly. 150 Grit Medium grit, ideal for contour the whole nail and shape natural free edge. 180 Grit Medium grit, ideal for contour the whole nail and shape natural free edge. 240 Grit Fine grit, ideal for smoothing artificial nails and shaping artificial and natural nails before apply nail polish. Natural nails require a finer grit. A fine grit is gentle and easy on the nails and the nail beds. On the other hand, artificial nails; such as acrylic, gel or silk require a courser grit on a file.