ForPro Zebra Foam Boards are made from the finest adhesive, foam and sandpaper. They feature coarse 100 grit on one side and medium 180 grit on the other to quickly and easily file nails to desired shape, giving edges a flawless finish. The cushioned core allows for fast, easy, and precise filing of nails. The manicure nail files are perfect for removing excess product leftover from gel and acrylic nails.ForPro Professional Collection features the highest quality, best value, and largest selection for professionals and consumers. All products include 100% unconditional guarantee.