Surfstrand Copper Trolling wire is bare, 1x7 stranded copper wire that has 13% greater density than stainless steel. This line sinks more rapidly than stainless steel, and allows you to troll deeper with less line in the water. The 1x7 strand construction gives this line good flexibility and kink resistance. Many anglers report increased strike rates with the use of copper terminal tackle - believing that the positive ions in copper help to attract fish.