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Fly fishing leaders are tapered monofilament or fluorocarbon lines that are attached to the end of a fly line to provide a smooth transition and presentation of the fly to the fish. Leaders come in various lengths and weights, with the taper helping to turn over the fly and prevent drag on the water. They are essential for casting accuracy and delicately presenting the fly to wary fish. Leaders also serve as a connection between the fly line and the fly, with the tippet section at the end being the thinnest part that attaches the fly to the leader.