Smoother Casting - Ultra Sensitive - Super Strong Older first generations superlines were made of abrasives that would cut rod guides and take a toll on equipment. This problem has been solved thru super slick, non-abrasive Spectra Fiber composition and unique EBT (Enhanced Body Technology) processing. It"s rounder and more compact for an unbelievable strength-to-size ratio. It has nearzero stretch and no reel memory. When you cast, Spectra Fiber sails effortlessly through guides for longer distances.