Natural nails are composed of delicate layers that seal together for strength. Using the wrong nail file can separate & damage these layers resulting in flaking & peeling nails. Filing your nails as recommended, using the correct emery board will promote healthy growth, so please make sure you have chosen the right type for your nails. This pack of 2 professional CUSHIONED emery boards are designed for Soft, Weak or Flaking nails. Directions of Use: Gently file in one direction Do not 'saw' back & forth as this causes more bad than good. Avoid filing into the sides of the nail as they provide strength & support The shape of the free edge of the nail should reflect the shape of your cuticle Toe nails should be filed straight across to avoid ingrowing nails