Designed for predator fishing, this leader wire is perfect for connecting your lure to your mainline. Can be knotted so no crimps needed. Single-strand knottable leader wire; produced from super-elastic Nickel-Titanium (NiTi) alloy which lends it properties not found in stainless steel wire. NiTi wire has an in-built shock property so stretches on the strike and recovers to set the hook!