A bare, 1x7 stranded-copper wire with 13% more density than stainless steel, so it sinks faster. This lets you troll deeper with less line in the water. It also offers good flexibility and kink resistance. AFW Copper Trolling Wire Lb. Test Diameter (in.) Length (ft.) 30 .031 300 30 .031 600 45 .035 300 45 .035 600 Cancer and Reproductive Harm- www.P65Warnings.ca Type: Leader Materials.