Opsin Fluorocarbon Leader – 60 lb (0.73 mm)Built for large tuna and heavy offshore applications when the drag goes up and the fight demands more from every piece of tackle. One of the stronger diameter stories in this class thinner than most listed competitors at 60 lb test. Why It Gets Bit: Thinner than 5 of 6 listed competitors at 0. 73 mm strong at heavy test without turning into unnecessary bulk the stealth advantage doesn't vanish just because the test weight climbs. Built for clean