Soft Round Lead Wire Spool - Fly Tying This soft round lead wire is a popular fly tying material and the traditional method for adding weight to flies. Wrapped along the hook shank before you tie, it sinks nymphs and other patterns down into the strike zone, and the soft wire wraps cleanly and easily at the vise. It comes on a convenient spool, and choosing the right diameter is simple. As a rough guide, match the wire to your hook size: .015 suits #13 and #14 hooks, .020 works for #12 and #10, .025 for #8 and #6, and .030 for #4 and larger hooks. Key Features The traditional material for weighting flies Soft wire wraps cleanly and easily on the hook shank Sinks nymphs and weighted patterns into the strike zone Comes on a convenient spool Available in multiple diameters to match your hook size Specifications Type Fly tying lead wire Shape Soft round wire Format Spool .015 diameter Suits #13 and #14 hooks .020 diameter Suits #12 and #10 hooks .025 diameter Suits #8 and #6 hooks .030 diameter Suits #4 and larger hooks