Seaguar Red Label Fluor Leader 40lb/25yd Leader Material S40RL25 34% better knot strength than leading competitor fluorocarbons. Fluorocarbon leaders' advanced strength allows use of smaller pound test vs. other fluorocarbons for more effective presentation. Incredible impact strength, knot strength and abrasion resistance. Ideal for larger species in fresh or salt water. As with all 100% Fluorocarbon products, FC Leader is much less visible underwater than monofilament line and virtually invisible to fish. FC is also UV resistant, chemical resistant, non-absorbent, high-density and impervious to cold conditions. Made from 100% Seaguar resins and produced using our proprietary extrusion process.