The Shimano Mastiff Fluorocarbon Line is engineered for anglers who demand precision, strength, and consistency in every cast. Designed and manufactured in Japan, it undergoes strict quality control to maintain consistent diameter, measured down to just 1 micron, resulting in smoother casting and improved performance, even with lightweight lures.

Featuring Shimanos advanced Nanoarmor technology, the lines surface is treated with microscopic textures that enhance knot strength and reduce slippage. This ensures more secure connections whether tying directly to a lure or using braid-to-leader setups. With excellent abrasion resistance and low visibility underwater, its ideal for targeting pressured or finicky fish.

Available in 200 yd spool. Weight options include 14 lb and 16 lb test.

Features:

• Premium fluorocarbon construction for low visibility underwater
• Ultra-consistent diameter improves casting distance and control
• Nanoarmor technology enhances knot strength and reduces slippage
• High abrasion resistance for fishing around structure
• Smooth handling for better line management
• Ideal for finesse and power fishing applications
• Designed for anglers seeking high-performance, tournament-ready line