The Opi 1-2-3 Luster Buff Board is a paper nail file in a flat shape, designed to provide a perfect shape to natural nails and to correct any imperfections in acrylic or gel nails. This file features different surfaces with a variety of grit hardness, allowing for customization of use according to your beauty needs. The larger the grits, the finer its texture, while conversely, as the grits decrease, the texture becomes coarser and rougher.