This is C&F's most standard fly case, consisting of two standard system forms.Designed to hold standard size trout flies from #12 to #18.By customizing the fly with micro-slit foam, it is easy to keep track of worn-out flies and you don't have to worry about forgetting to replenish them. .It does not crush the hackle wrapped around the underside of the hook shank, so any pattern can be stored.