Original SHIMANO Mastiff FC 3LB-20LB Fluorocarbon Transparent Color Fiber Fishing Line 90M Made in Japan

100% Fluorocarbon. 3–20lb. 90M. Transparent. Made in Japan. Shimano Mastiff FC Fishing Line.

The Shimano Mastiff FC is a 100% fluorocarbon fishing line made in Japan — built for anglers who need the invisibility, sensitivity, and abrasion resistance of pure fluorocarbon in a premium Japanese-manufactured line. From 3lb light finesse applications to 20lb heavy leader use, the Mastiff FC covers the full range of freshwater and saltwater fluorocarbon needs in a 90M spool that's ideal for leader material and light main line applications.

100% Fluorocarbon. Made in Japan. 3–20lb.

• 100% Fluorocarbon Construction — Solid fluorocarbon all the way through — not a coating — for consistent invisibility, sensitivity, and abrasion resistance from the first cast to the last.
• Nearly Invisible Underwater — A refractive index close to water makes this line nearly impossible for fish to detect, giving your lures and baits the most natural presentation possible in clear water and pressured conditions.
• 3–20lb Breaking Strength Range — A wide range covering ultra-light finesse applications through to heavy leader material for larger freshwater and inshore saltwater species.
• Sinking Line Profile — Denser than water, fluorocarbon sinks quickly for better lure depth control and more direct contact with your presentation.
• Low Stretch Sensitivity — Minimal stretch transmits vibrations directly to your rod for detecting subtle bites and bottom composition changes.
• Abrasion Resistant — Handles rocks, timber, and structure without fraying or weakening — critical when fish run for cover.
• 90M Spool — An ideal length for leader material and light main line applications.
• Made in Japan — Manufactured to Shimano's exacting Japanese quality standards.

Who It's For

Freshwater and inshore saltwater anglers who want Shimano's premium Japanese fluorocarbon for leader material, finesse main line, and any situation where line invisibility and sensitivity are critical to getting bites.