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The wire attaching the hook stops you from being bitten off.
The heavy line acts as a rubbing leader if the fish twists up the trace.
Sakuma Tope Rig
A boat rig. The wire trace prevents bite offs and the heavy line acts as a rubbing leader.
80Lb sakuma Supacast body
Dart Boom
100lb Sakuma Wire
8/0 Manta Extra Hook
HAND TIED IN THE UK.