Fin Set Thruster.
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K4's super Stiff technology, combined with a precision CNC'd foil and hours of testing, has resulted in a top performing kite surfboard fin.
The K4's technology flexes and works with you to allow crazy grip, full speed turns, and the most extreme vertical hacks. The material that's used, combined with the design of the fin, allow you to push and perform harder and better than ever before.
Control, speed, and maneuverability are the three key performance characteristics of these fins.