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A stone to sharpen and a steel to keep it sharp. Can't speak for the leather strop as I've never used one, maybe I'm too young.....but I'm guessing it does the same as the steel. An extra fine edge...

As far as a suitable steel for in the field we don't have a lot of options if you want to keep it compact. Assuming you are looking small and compact for the field Three O'Three

Is that like the little rabbiters steel that comes with the knife and sheath at most hunting shops?