The Shimano Mastiff is a premium 100% fluorocarbon line produced in Japan, designed for reliability, strength, and smoothness. Engineered with Shimano’s Nanoarmor® technology, it features nano-sized ridges on the outer surface that enhance knot strength and reduce slippage, providing extra durability against stress from casting and lure movements. Mastiff’s increased smoothness and toughness offer anglers the confidence needed for consistent performance on the water.

• Featuring Shimano’s innovative Nanoarmor™ technology, Mastiff significantly improves durability and increases the binding strength of knots
• Imperceptible to human touch, these micro-ridges on the outer layer of the line prevent knot-slipping during battles with large fish and minimize slippage and breakage during common bass angling techniques like twitching, jerking, and casting large lures
• Mastiff is crafted in Japan using 100% fluorocarbon and subjected to stringent quality control measures
• Rigorous inspection at the factory ensures an even surface down to just 1 micron, far surpassing the industry standards
• Mastiff’s low linear elongation proves unmatched sensitivity, allowing anglers to feel the slightest disturbance on the line
• Responsive performance and a supple surface enable frictionless casting, optimal control and effortless hooks