Premium, highly abrasion resistant polyester cover and composite core of MFP (multi-filament polypropylene) and super high strength, lightweight AmSteel fiber. Compare a double braid polyester to XLS Extra: A 1/2" diameter polyester double braid can weigh 8.6 pounds per 100 feet or more. XLS Extra 1/2" diameter weighs only 7.7 pounds per 100 feet! This is a total savings of more than 10% in total rope weight. XLS Extra has extremely low stretch: as much as 65% less than other double braided lines. Works well for all applications, and makes an excellent wire halyard replacement! Splicing technique-- Core Splice. Size Diameter: 7/16" Approx. Strength: 6,100 lbs. Approx. Weight /100’: 5.7 lbs.