https://www.fawcettsonline.com/product-category/fishing/game-fishing/fly-lines/fly-line-backing/
Fly Line Backing - Fawcetts Online
fly line backingfawcettsonline
https://www.oldsoulsupplyco.com/product/rio-fly-line-backing-100-yards/X6Q67BNRCFZ5MZ36EJK3K43H
Rio Fly Line Backing - 100 yards | Old Soul Supply Co.
RIO’s traditional Dacron® braided backing features high strength and low stretch and is unsurpassed in quality. A good compromise between thinness and the...
fly line backingold soulrioyardssupply
https://www.madriveroutfitters.com/p-19452-cortland-hollow-x-spliceable-fly-line-backing-70lb.aspx?
Cortland Hollow-X Spliceable Fly Line Backing- 70lb White
Cortland Hollow-X Spliceable Fly LIne Backing, backing is specifically designed to splice in fly lines for a knotless backing connection.....but of course...
fly line backingcortlandhollowspliceablewhite