PIRANHA V2 Quad/Twin: WavePIRANHA V2: Pure Wave Adaptive G 10 windsurfing fin AREA: 100 110 121 147 cm2 The new version of our Piranha fin is the result of our efforts to produce a wave fin that is incredibly efficient in harsh conditions. The extensive work we put on making the first version with the humpback wave bumps made us rethink fin design. Thus we kept expanding on the idea of the bumps but due to problems with accumulation of weeds or other residu on the leading edge