Our saltwater IGFA class fluorocarbon, sea-wulff, is designed for the rigors of saltwater fishing; extreme loads and shock resistance, as well as durability and abrasion resistance. Sea-wulff pure fluorocarbon has nearly the refractive index of water - making it virtually invisible. Plus it doesn't absorb water, and,unlike nylon, is resistant to UV rays. Additionally, its sink rate is greater than standard monos due to its higher specific gravity. All leaders ifga class, 9' long.