Set of 2 transparent, simple-design heel files. - Brand: FIVE SHINE - Item Type: Heel file, nail file - Set Contents: Set of 2 (2 types of files) - Material: Glass - Design: Transparent and simple design Thank you for viewing. These are 5 Seconds Shine files. The fine irregularities of the glass scrape away calluses on the heels. Because they are glass, they can only remove hardened calluses. As the product name suggests, by regularly using them for about 5 seconds each time, you can improve cracked heels. I am selling these because they have improved my cracked heels. The nail file is for caring for the surface of your nails. These are used items, so there are some minor scratches. There are no problems with use, but please refrain from purchasing if you are concerned about this.