Size:18x2.8x0.4cm Package : 50pcs Nail FileMaterial:Sandpaper on surface,Sponge(EVA) on second layer, Plastic(PP) in middle-level.Usage:1)Essential nail art tools for filing nails before nail treatment / nail extension / manicure procedures2)Can be used to file natural nails, false nails, nail extensions, etc.3)Perfect for finger care, woodworking, and salon usage