Soft, castable and virtually invisible to fish, Seaguar's high-performing INVIZX Fluorocarbon Fishing Line is ideal for both spinning and casting reels Ideal for freshwater multi-species fishing applications — fish can’t see it and it’s very soft and sensitive. Easy to manage on a reel Soft & strong with exceptional sensitivity, low memory, virtually no stretch, fast sinking and superior knot strength for unmatched performance — in most any conditions Seaguar InvizX is a best-selling fluorocarbon mainline engineered to provide extremely low memory which makes it soft, supple and more castable Only Seaguar makes its own fluorocarbon resins — exclusively formulated to assure optimum performance