This strong 4X extra heavy wire is the perfect choice for tying a variety of nymphs and wet flies. It is made to withstand the pressure of bigger river fish like salmon and steelhead. The Mustad Signature fly hooks feature unique sharpness and strength. Developed in cooperation with the world's top fly tiers to exact proportions between gap, bend, wire diameter and shank length for precise scaling unmatched by others. The micro barb can easily be pinched down without damaging the hook for barbless applications. Bronze finish. Chemically sharpened, Nor-Tempered high carbon steel.