The perfect way to connect your high-performance two-handed Spey and single-hand overhead shooting heads to your fly reel's backing, Rio's PowerFlex Core Running Lines measure 100 ft long and are thinner, smoother, tangle less, float higher and shoot farther than any we've used or seen. Looped large at the front for easy interchangeability and available in your choice of three floating diameters, Rio's PowerFlex Core Shooting Lines are what you reach for when max distance is key.