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.
This is great line. Thin diamater, flexible, and easy ti tie. Very fast service received in 3 days. Best part was a shipping mixup sent me the wrong size spool. With only 1 phone call they sent me the right one and just asked me to return wrong one when possible. GREAT SERVIVE Thank you