Mastery Series Fluorocarbon II Tippet Material is technologically advanced for the best performance you've ever experienced. Patented doubled-structured fluorocarbon offers the latest improvements in the industry Two exclusive fluoro resins combine for a softer, stronger fluorocarbon material This unique combination creates a leader that is harder and more abrasion-resistant on the outside, but with a softer, more supple core that is easier to fish and more productive Leader weights are formulated per application: 7x-3x tippet is formulated with a softer, more supple core ideal for small game 2x-0x tippet is formulated with a harder, more abrasion-resistant material that is perfect for bigger fish and harsh environments With a refractive index nearly identical to water, this new tippet material also offers the ultimate in ultra-low visibility — fish can't see it as easily as they see nylon, which allows you to use a heavier weight than normal Tensile and knot strength are unmatched in the industry Absolute minimal water absorption for enduring strength and performance Fluorocarbon II Tippet is 100% fluorocarbon and not a copolymer. Its unique formulation provides superior knot strength, virtual invisibility in the water, superior abrasion resistance, and minimal absorption of water. Vendor: Scientific Anglers