The same quick and easy-to-use wind-on leaders but with fluorocarbons instead of monofilament. They still use the Spectra® Fiber Braid for making the loops. The great advantage of fluorocarbon over mono is the fluorocarbon is closer to water in its light-refracting properties, therefore less visible in the water. Fluorocarbon also sinks twice as fast as mono. Leaders are 25 feet long.