It is in water drop, to optimize aerodynamics.
It is double throat to be able to be used as hollow stay.
It is delivered in only one piece to avoid the sleeves (weight and hard point) and to optimize the stiffness of stay. (of this fact there is no risk to see the hollow stay being disassembled).
It makes it possible to install a stay without recutting it or to have recourse to manual or dismountable terminals in eye.