Copper or lead-core for flatline out the back?

[markmonkey1]

For a single flatline down the center of your spread, way far back...do you like copper or lead-core? Why? I'm thinking the fleas may be less likely to grab onto the copper.

 

 

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[FishingFool34]

I've never had issues with fleas on leadcore, granted I only run up to 5 colors off boards so maybe they are worse deeper than my LC gets. Also would depend on how deep you want your center bait to run.