Orvis Dacron Fly Line Backing, 30 lb Test, White - 50, 75, 100, 150, 200, 250, 300, up to 2500 yds Orvis backing is braided Dacron on spools, precision processed with uniform strength. 30-lb. test is great for steelhead, salmon, bonefish, stripers, and more. 20-lb. test is for trout, bass and most freshwater fishing. Orvis fly line backing is as trustworthy as our passion for the sport. Made in USA. Various lengths available wound from bulk spools of OrvisDacron Backing. You only have to buy what you need - enough to fill one reel or buy in bulk.