I use these pens on 5-1/4 inch floppy disks because they were solid black plastic and otherwise required a white paper label. You don't see them anymore, but I've taken to using them to mark hot rolled steel. I'm sure there are other things they would be great for - black poster board and foam, glass, ceramic - anything you need as a sharp marking line on a dark, low-contrast surface. This set should get me further. for some time.
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