ForPro O-Files Wood Boards are specially designed for ultimate convenience, hygiene, and quality. They feature coarse 100 grit on one side and medium 180 grit on the other side to quickly and easily file nails to the desired shape, giving edges a flawless finish. Perfect for removing excess product leftover from gel polish and acrylic residue. Each board and file is packed in its own self-seal bag for easy opening. Recommended for one and done use and to give to clients after the service. Washable and sanitizable. ForPro Professional Collection features the highest quality, best value, and the largest selection for professionals and consumers. All products include a 100% unconditional guarantee.