Indicated for all types of nails. The coarser-grained red side for filing and the finer white side for polishing. It allows a gradual filing thanks to the two types of grammage. 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.