10 pcs Professional Thick Sandpaper Nail File Essential nail art tools for filing nails before nail treatment / nail extension / manicure procedures Can be used to file natural nails, false nails, nail extensions, etc. Perfect for finger care, woodworking, and salon usage Length: 17.5cm Width: 2cm Stickness:4mm Sandpaper on surface, foam on second layer, plastic in middle-level. Resistance to fracture.