Get the reliability you need to reel in tough fish with the Shimano Mastiff 20 lb 200 yd Fluorocarbon Fishing Line. The line is made of fluorocarbon for strength, durability and smoothness, while the NANOARMOR technology increases the binding strength of knots while minimizing slipping and breakage. Shimano Mastiff 20 lb 200 yd Fluorocarbon Fishing Line, 20 Lbs - Fishing Lines at Academy Sports