On the Smith’s pocket pal the labeling will wear off, especially if carried in your pocket. I have marked mine with 1 for carbide 11 for ceramic. It’s scraped into the plastic because even when new I can’t read it without glasses. I have found for 3.5 inch or less of blade length I pull the blade through the sharpener. Longer blades I pull the sharpener over the blade with the knife held steady by what ever is handy.

Best of luck to you.