Royal Wulff GSP Fly Line Backing Gel Spun Poly 30# 300 YDS,600YDS,1200YDS 10lb. 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.