THIS NEXT GENERATION fluorocarbon tippet material is not only exceptionally strong relative to its weight class, but also highly abrasion resistant even in the most demanding fly fishing environments. Our Synchro Dynamic System (SDS) fluorocarbon benefits from a very low refractive index, making it almost invisible when submerged in water. Very low refractive index High abrasion resistance Increased knot strength High strength to diameter ratio Unlimited lifespan