Made of tempered glass. Lightweight and very resistant, it shapes natural or acrylic nails. The tempered glass provides an extremely delicate filing, which is why it is indicated for fragile nails, it avoids chipping. How to use File following the natural shape of your nails and always in the same direction. If you want a square point, keep the file perpendicular and straight. If you prefer a rounded or oval finish, angle the file below the free edge of the nail and file the corners well.