STRONG & DURABLE - Fluorocarbon coating.Super great tensile and knot strength.None of its physical properties change after a prolonged soaking without damage. LOW VISIBILITY - Fluorocarbon is the less visible material when immersed in water.The combination of the two materials maximizes the advantage of fluorocarbon invisibility with the low memory and superior castability of copolymer. FASTER SINK RATE - Low Stretch, high strength, higher density.Faster sink rate for less water resistance. Helping your fly to the bottom quicker without adding extra weight.Thus you get a more delicate presentation. EXCELLENT ABRASION RESISTANCE - Superior abrasion resistance, The surface of fluorocarbon monofilament is harder , making it substantially more resistant to abrasion. Stronger,Smoother,More Flexible for easy casting. KNOTLESS - Super great tensile and knot strength.Fluorocarbon fishing line sinks faster with low absorption. The unique fluorocarbon materials make the line extremely durable, offer great knot strength, and exceed in sensitivity.