This design features a "wedge" stringer - 4mm at the nose to 0 mm at the trailing fin. EPS/Epoxy composites tend to be a rigid board. They are difficult to flex in the same manner as a similar Poly board. Lighter glass schedule and a "core" with minimum flex forward and a variable degree of flex aft provides the type of "flex and memory" required to perform maneuvers at speed.
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