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Skagit lines/heads are short and heavy - even shorter than Scandinavian lines in most cases; working on a ratio of less than three times the rod length. Skagit lines do need a front tip added (whether floating or sinking) before they are ready to fish. They are the newest design of spey line on the market and the strength of Skagit lines is that they lift weight very easily. Anyone fishing large or heavy flies will find nothing casts these easier than a Skagit line. Likewise, a fast sinking tip is far easier to cast on the end of a Skagit line than either of the other two types. Also, as Skagit heads are so short, they are the easiest of all spey line designs to cast, and certainly the best for the tightest of back casting spaces.
The disadvantage with Skagit lines is that they don't have the same kind of presentation as the other two types, and tend to be clunkier when they land. Because they are so short, they also have a lot of stripping in after each cast has fished out.