Fluorocarbon leader material like Shimano’s new EX Fluoro Ocea Leader provides a number of advantages to discerning anglers dealing with wary fish under difficult fishing conditions. It’s thinner than equivalent breaking strain nylon, highly abrasion resistant, doesn’t absorb water so it sinks faster, is clear in colour and, with its refractive index being pretty close to that of water, is therefore less visible to fish. It comes in 50m dispenser spools with a line retainer in 30, 40, 50, 60, 80 and 100 pound breaking strains.