The Orvis Gel-Spun Backing, with a 30-lb. test and 250-yard capacity, is designed for anglers targeting the biggest and strongest game fish. This backing offers 60% more capacity than traditional Dacron and is 10 times stronger than steel in equal diameters. Its high strength and thinner diameter make it perfect for handling long runs and large fish, providing the extra backing capacity needed for demanding fly-fishing scenarios.