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 fishing line backing is 10 times stronger than steel in equal diameters. A very small diameter for higher yardage on the fly reel means slower spool rpms on runs and faster pickups. Gel-Spun has virtually no stretch, is extremely abrasion resistant, yet has a very low coefficient of friction so fishing line backing will not damage your fly rod\\\'s guides, and retains 100% of its strength while in the water. Unaffected by UV, petrol, oil, salt, or detergents. Fly fishing line backing comes in 30- and 45-lb. test. Made in USA.