On the double built rods there's 2 layers of bamboo... in the butt section anyway
On the interior, the sections are planed to a pie shape like normal. Then there's a second layer glued over that of the "powerfibers"
That's the way I understand it anyway
It makes for a hefty rod
The #25 is easily a 7wt. Unusual for a 7'6"
And I believe that was the shortest rod that SB made at the time.
The simpler the outfit, the more skill it takes to manage it, and the more pleasure one gets in his achievements.
--- Horace Kephart