Royal Wulff GSP Fly Line Backing Gel Spun Poly 50# 300 YDS, 600YDS, 1200YDS 12lb. Diameter
Now in a bright new package, our GSP (Gel Spun Poly) ultra thin backing is popular with saltwater fly anglers looking for a small diameter backing. Gives you more capacity to accommodate longer-running saltwater game species. Available in 30# and 50# test in a variety of spool sizes.