The keys to nymphing are feeling the strike and setting the hook. Our new 0 wt. and 1 wt. competition, mono core lines excel at both. Built with the same proven taper as their larger, braided-core cousins, these ultra-sensitive, heron blue lines feature a thin, hard monofilament core. Perfectly round and stiff, this core transfers energy better and reduces line sag between rod guides — improving feel, preventing drag and increasing your fishing range.