Hi Rory. Thanks for the info. I did some fly fishing as a youngster. Always heard people talk aboute backing but never took any notice on it. I used normal mono on my reel and never realy needed it. Use to catch bass and small yellows but dropped the fly fishing about 18 years ago. I am already doing rock and surf, fresh water pap gooi, bass and some soult water lure fishing. Don't think my wife will be very happy if I star flying again. Thanks again.