100% fluorocarbon leader line – Riverge is slightly stiffer than Grand Max and is particularly suited to fishing with droppers. This greater rigidity also makes for an easier turnover on the cast. It is virtually invisible in water. Fluorocarbon tippets sink readily without treatment as they are heavier than nylon. Using standard knots it will retain 100% strength over time in water, compared to 20% strength loss of nylon.