The RIO(R) Fluoroflex Plus Tippet is one of the strongest lines on the market today. The Fluroflex Plus Tippet is made of 100% fluorocarbon, which provides the strength for a fantastic performance when fishing for trout. The fluorocarbon is very thin, making it practically invisible to fish. The line is very flexible, so you can be certain you'll be able to tie excellent knots when using it. FEATURES: Made of strong 100% fluorocarbon Thin to make line nearly invisible to fish Flexible so you can easily tie knots SPECS: 5X Model: 6-22305 Line Size: 5x Lb Test: 5 lbs. Total Length: 30 yds. Diameter: 0.006 in. 4X Model: 6-22304 Line Size: 4x Lb Test: 7 lbs. Total Length: 30 yds. Diameter: 0.007 in. 3X Model: 6-22303 Line Size: 3X Lb Test: 8.5 lbs. Total Length: 30 yds. Diameter: 0.008 in.