The spine is made of four segments of .2100 pultruded carbon spars. Adjustable tension is supplied through a bead system at the tail. This is a nice feature. With the wide range of temperatures during the spring season, it seemed that each time I flew the kite, I used a different number of beads to achieve the same amount of tension. Curvature is added to the sail at eight locations along the length of the kite through a bow-like system of solid carbon rods and Dacron sleeving which is sleeved over itself.
Wind speed determines the depth of the bow.
The kite comes with a very detailed booklet with nice diagrams on how to assemble the kite properly. Since most of my flying is limited to stunt kites, and flying alone, I was concerned about how I would be able to get this kite balanced on one point and then launched. However, my fears were for naught. As I stepped away from my van holding the top bridle line, the kite was begging to be launched. The kite easily launched from my hand and sailed skyward.