Fly fishing is not possible without some sort of fly line. Backing is usually braid that goes on the reel first to not only bulk out the spool but to add length to the fly line which, usually at most, doesn’t exceed 100ft. Fly lines come in a great number of types for the different way to fish. In New Zealand most fishing methods are used. After the fly line generally there will be a tapered leader then some terminal tippet.