Tungsten Beads - Black Nickel Pack of 20 high-quality tungsten beads for tying nymphs. These beads are mainly used for tying the following flies: nymphs, streamers, eggs, blobs and wet flies. Color: Black Nickel (Black Nickel) 10 sizes available. Bead diameter Bead weight 1.5 mm 0.02 g 2.0 mm 0.05..