Berkley FireLine Superline Fishing Line Thin diameter for low visibility. 3 times stronger than monofilament. Ultimate sensitivity. Smooth finish for fast casting. 1500-yd spool. Diameter: 0.005" (0.13mm). Diameter (mono equivalent): 1. Weight: 4 lb test. Color: Smoke. Diameter: 0.006" (0.15mm). Diameter (mono equivalent): 2. Weight: 6 lb test. Color: Smoke. Diameter: 0.007" (0.18mm). Diameter (mono equivalent): 3.