Fly lines dimension numbers concern weight- the greater the number, the larger the line. Heavier lines are used with larger flies as well as fish, as well as lighter lines are used for smaller flies as well as fish. There are some convenient graphes out there to aid identify which line size they need to be utilizing.
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Usually, the bigger the weight of line the better the line rate so it is a good idea to take that right into account. It will certainly often have more influence as it attacks the water too. There are times when a more fragile hand is desired to not terrify the beans from the fish with the line slapping the water.