RIO Bass Leader - RIO's bass leaders are designed and built to match the needs of the bass fly fisher. The leaders are made of a medium stiff nylon and have a powerful taper design that will easily turn over large flies, and cope with tough winds. The copolymer material is incredibly tough and abrasion resistant. Medium stiff material for turning over larger flies Powerful butt section and taper for great turnover Maximum strength and abrasion resistance