When the Sage designers were developing the ultra-high performance TCR rods , they discovered there wasn't a fly line in existence that could fully maximize the action of these rods. So Sage took on the task of designing and building a new line, with an extended belly for greater line control, and a narrower running section for serious shooting distance. Oh, yeah, they're 110 feet long. Cast one and you'll understand why. Available in line weights 5 through 9.