Thin files with a thickness of 2mm, to facilitate filing in nail corners. The wooden files are tough, but also flexible without breaking. One side of the file is 100# grain and is for filing the nails. The other, 180# grain, is great for finishing. The main reason this file is tapered, is so that it has a narrower end, for filing small nails and a wider end, for filing larger nails. In the "Zebra" files, the grain does not crumble easily, making them more durable. Wooden files are only used on natural nails, without varnish, gel, acrylic, etc. The files can be disinfected by spraying and should not be immersed in disinfectant liquids. Mossi Epil.