100 grit long lasting black straight, square, moon shape nail file. Professional slim sanding paper nail file. Essential nail art tools for filing nails before nail care / nail extension / manicure procedure. It can be used to file natural nails, false nails, nail extension, etc.Perfect for finger care, woodworking, and salon use. Sandpaper on surface, foam on second layer, plastic in middle level. Resistance to breakage.