Cabela's Prestige White Fly Line Backing -
Prestige™ Fly Line Backing is a Dacron backing that won't rot or mildew. This backing is White and available in either 100 yards of 20-lb. test, or 200 yards of 30-lb. test. The 20-lb. test has a .012" diameter and the 30-lb. test has a .016" diameter.
Available: 20-lb., 30-lb.