Lead core line has been around for decades, but it's recently had a resurgence with anglers. The reason? It presents lure in a fashion that can't be duplicated any other way and it catches fish. The line has a high-density lead core. The lead core is then encapsulated in a durable, polyester fiber sheath for strength and abrasive-resistance. The line changes colors every 10 yards so you can meter how much line you have out. Sufix Lead-Core runs in a ten color sequence and is available line tests from 12 to 18 pounds.