Opsin Fluorocarbon Leader – 15 lb (0.35 mm) | 100 ydBuilt for stripers, calico bass, and structure oriented species where stealth still matters but 12 lb no longer provides enough backbone. The transition size where stealth and backbone meet. Why It Gets Bit: Enough diameter control to stay clean in clearer water thinner than most leaders in this class, which matters when calico and stripers are still inspecting the leader around kelp and structure. Better control around kelp, docks, and mid grade