From Sky Shark:

Sky Shark™ Competition Air Frames are world renowned as the very best competition tubes. It is no wonder, the best flyers in the world use Sky Shark™ Air Frames. The facts speak for themselves, there is no equal to the weight to stiffness of Sky Shark™. The consistent quality of the fibers and tubes offer un-matched reliability and performance. Sky Shark™ is commited to bringing the the very best to kite flyers of all abilities. Whatever level of kite you fly or manufacture, use the very best products, Sky Shark Kite™ Products.