Cortland Gel Spun Backing - Yellow Length:2500yd Cul de canard (CDC) known

Cul de canard (CDC) known as the "duck bottom" are the feathers from the duck's back around the preen gland and they provide super buoyancy due to the preen oil

And side shields

The taper design gives incredible loop stability at distance and a front taper that delivers perfect presentation of flies between sizes #2 and #22

while a secret blend of nylon results in the strength to bring the fish to net

Features include 5-disc alternating carbon fiber/stainless steel drag and CNC-milled fly engravings on frame interior

Cortland Gel Spun Backing - Yellow Length:2500yd Cul de canard (CDC) knownCortland Gel Spun Fly Line Backing Hi Vis Yellow Cortlands Gel Spun backing is made from super high strength gel spun fibers, braided to exact specifications. The tight, round braid allows you to pack a lot of backing onto small spools. Available in hi vis yellow, pink, blue, and white, in 30 lb., 50 lb., and 80 lb. test on 300 and 2500 yard spools.