The Black Magic Fluorocarbon Leader has a refractive index that makes it appear clear underwater and virtually invisible to any nearby fish. This is important when fishing in clear water, where line visibility has the potential to spook a fish from your bait or lure. It is also useful if the fishing is shut down and you want to try some finesse-style fishing. This line is rated to 15 pounds, which is a versatile line rating because it has a small enough diameter to fish in estuaries for flathead and jewfish, but it is also strong enough to be used offshore for reef species such as snapper and morwong. Fluorocarbon is a great leader material when fishing with braid. Simply connect the 2 lines with an Albright knot, or any other of the knots that create a strong connection between 2 lines. It is also abrasive and UV-resistant, to ensure that your line stays in good working order. The Black Magic Fluorocarbon Leader will take even the most cautious and wary fish by surprise, so you can catch more fish!