Specification BreakingStrength : 20 pounds BulletPoint1 : Scientific Anglers Dacron Fly Line Backing is built with advanced 3M technology that allows for a small-diameter backing without losing the inherent strength of the backing material. BulletPoint2 : Exceptionally thin material for more reel capacity. BulletPoint3 : Low coefficient of friction minimizes wear on guides. BulletPoint4 : Various lengths available wound from bulk spools of Scientific Anglers Dacron Backing. BulletPoint5 : You only have to buy what you need - enough to fill one reel or buy in bulk. ExternallyAssignedProductIdentifier1 : 0638827611057 ExternallyAssignedProductIdentifier2 : 638827611057 FishingLineType : Fly ItemName : SA Fly Line Backing, Dacron, 20 lb Test, White- 100, 150, 200, 250, 300, 400, 600 up to 5000 yds (400 yds) ItemTypeKeyword : fly-fishing-line LineWeight : 20 pounds Manufacturer : Scientific Anglers Material : dacron ProductSiteLaunchDate : 2015-02-27T21:33:30.248Z Size : 400 yds UnitCount : 1 UnspscCode : 49131500