These super fine files are 0.2mm thick and photo-etched for narrow space sanding of your models. These files will get to places no other file can reach! Note: The 4th, 5th & 6th files in the picture are not a processed file. These are used for a strengthening support for the 1st, 2nd & 3rd files by laying them under the actual file. Or you can use them as stiffeners for thin sand papers.