The first graphite fly rod I bought was back in 1990. It was a Sage DS2 9' 6/7 2 pc rod. When I asked the guy in the fly shop why two lines, he said that it was really a 6wt but some folks who are just starting out fly fishing, might find it easier to use a 7. For years I used a 6 wff line on it and was pleased.

Dave