Not scales but blade. My brother gifted me a carbon fiber neck knife a couple years back. It is a neat little thing, lite as a feather but mostly a last ditch item. I can't see these being used for much other than a letter opener or maybe opening boxes, and I think even those limited functions might be too much over a long period of time. I've not really used it much, does anyone else have one and what are it's uses and how long will it hold an edge for the above uses? Also, anyone ever sharpen one?