Shimano Wind-On Leaders are available in 80, 100, 150, 200, 300 and 400lb breaking strains.

They have a Dacron loop at the end, and when attached to a doubled main line, allows the angler to wind it straight through the guides and onto the reel.

This means fish can be controlled boat side far more easily, and can be netted, gaffed or tagged without anyone having to touch the leader.