Tough use equals tough need. Don&';t just settle for cheap, cause chances are you&';ll get cheap product. Seaguar now offers a fast sinking line that gets your hook to your strike zone faster. Delivering incredible abrasion resistance, you can even fish through crazy structures and murk, without a single hitch or problem. With small line diameters, you get significantly lower visibility in the waters, making Trout, Salmon and Steelhead quiver in there shadowy hideouts.Line Diameters: 20lbs: .405 mm or .016" 25 lbs: .470 mm or .017" 30 lbs: .520 or .020" 30% Better knot strength Genuine 100% fluorocarbon leader material Delivers incredible abrasion resistance Maximum impact and knot strength Smaller line diameter than monofilament Fast-sinking Gets you in the "strike zone" quicker Lower refractive index than monofilament Less visible underwater The optimum choice for fishing Salmon, Trout and Steelhead