A simple but deadly straight running bullet design.
The Double O' is excellent on Tuna, Dolphin, Wahoo and Marlin in the XL configuration.
This streamlined low drag head with balanced cone shaped insert really settles into its comfort zone at fast speeds even in excess of 18-knts. When specifically targeting Marlin or Billfish, try running the Double O from a center rigger or bridge pole way back in the spread, often its the lazy (low risk) straggler that gets that gun shy fish to eat.
Comes in four dangerously effective sizes.