Blue Label Fluorocarbon Leader – Incredible Impact and Abrasion Resistance. Fast Sinking, Double Structure for Strength and Softness. The Original Fluoro Leader Our exclusive double-structure process fuses two 100% fluorocarbon resins to create a leader with exceptional knot and tensile strength. For any water type, Blue Label is a great all-purpose fishing line leader Seaguar Blue Label Leader Material is known the world over for its incredible impact strength and abrasion resistance Whether you’re trolling, casting plugs or deep water jigging, Blue Label helps you make solid hook-ups and keep fish pegged.