The award winning Ultralite range of fly rods features SINTRIX NSX construction. This proprietary material is based on our industry changing original SINTRIX technolgy that has been combined with a second classified material allowing us to build an even lighter and stronger fly rod. ##This lighter weight material provides targeted modification of the blank design while further strengthening the blank strength. The net result is a lighter and more responsive rod that allows the angler to "feel" the line load during the casting stroke, giving a greater degree of control than ever before. ##The reel seat on the Ultralite is a masterpiece of form and function-moving more of the rod's weight behind the hand giving unsurpassed in-hand balance. The single start threading resist the reel loosening under heavy use and has a keyed body to further ensure a snug and aligned fit for your reel.