Since then, Seaguar has advanced many steps to arrive at the product we're so proud to present today. The first puzzle provided by the 1970's version of Fluorocarbon fishing line was how to improve knot strength for Leader and Tippet applications. Seaguar engineers decided it would be quite difficult to improve on knot strength without changing the structure of the line and they did not want to compromise the benefits that had been achieved thus far. So, once again with Mr. Ohhira at the helm, Seaguar began to think about a revolutionary double structure line...comprised of two different resins but still resulting in a single structure, impossible to separate, made exlusively with 100% Seaguar produced Fluorocarbon resin and Seaguar managed extrusion processes, with all the same qualities of Seaguar's single structure line and more.

The only problem with the double structure concept was that the two resin formulation and structure made extrusion, a difficult process, much more difficult. It would not be until 1983, with the contribution of improved extrustion processes designed by Mr. Akiyama of Kureha, Japan, that Seaguar introduced Seaguar Ace Leader, recognized as Red Label in the U.S. market today. Today's Double Structure Technology products include Seagar's Red Label, Grand Max, Grand Max FX and Fluoro Premier brand Leaders and Tippets. Seaguar's Double Structure Technology provides a core 100% Seaguar Fluorocarbon resin that is harder, and an outer 100% Seaguar Fluorocarbon resin that is softer for a better grip effect when knotted.