Fly lines dimension numbers pertain to weight- the higher the number, the heavier the line. Much heavier lines are relied on with bigger flies and also fish, as well as lighter lines are relied on for smaller sized flies and fish. There are some convenient charts around that can help identify which line size they ought to be using.
That really raises an important point. A bunch of a fly fisher's "success" (also that is determined subjectively) relies on their design as well as their skill degree. What may function perfectly for one could not function at all for one more. It is a fantastic idea to speak to individuals that have encounter and also have actually tried different points and also have found what works for them. Visit a local fly shop or ask questions in on the internet forums. One more great source is the smaller sized online fly fishing retailers. Often the smaller companies will take the additional time to address your inquiries and provide advice.