Medium stiff, 100% fluorocarbon. Ideal for Steelhead, Salmon, Trout and Bass. medium stiff, 100% fluorocarbon ideal for steelhead, salmon, trout and bass the flex of the material is best for larger flies Fluoroflex Freshwater Tippet is a medium stiff, 100% fluorocarbon tippet material and is ideal for Steelhead, Salmon, Trout and Bass, and for casting larger flies. Clear in color, this freshwater tippet is nearly invisible to fish. It is available in the following sizes: 7X (2lb) to 0X (12lb) - 30 yards per spool 0.013" (16lb) to 0.015" (20lb) - 25 yards per spool Medium stiff, 100% fluorocarbon. Ideal for Steelhead, Salmon, Trout and Bass.