100% fluorocarbon tippet line – the Seaguar “Double Structure Technology” makes Seaguar Grand Max FX incredibly strong and flexible with superior knot strength for diameter. Seaguar Grand Max FX is slightly softer than standard Seaguar Grand Max, allowing knots to bed down perfectly which aids strength and reduces knot size significantly. Perfect for trout tippet use. Available in 30yds spools: 0.16mm / 6lbs / 5X 0.185mm / 7.5lbs / 4X 0.210mm / 9.5lbs / 3X