Use this high capacity fly line backing for big game angling. Maximum strength fly line backing with up to 60% more capacity than Dacron. 35-lb.-test Gel-Spun Backing gives you more capacity than using 20-lb. Dacron, which is why it is the backing of choice for big-game angling. Braided from gel-spun polyethylene, this incredible fly line backing is 10 times stronger than steel in equal diameters. A very small diameter for higher yardage on the reel means slower spool rpms on runs and faster pickups. Gel-Spun fly line backing has virtually no stretch, is extremely abrasion-resistant, yet has a very low coefficient of friction so it will not damage your fly rod guides, and retains 100% of its strength while in the water. Unaffected by UV, gas, oil, salt or detergents. Fly line backing comes in 35- and 50-lb. test.