PIRANHA Quad/Twin: Wave ---10 % off---PIRANHA: Pure Wave Adaptive G 10 windsurfing fin AREA: 100 110 121 147 cm2 After releasing the HB concept last year we kept on working on the HB project with different fin combinations from quad fins to slalom and after testing and re testing we have come up with an incredible line that is more then an evolution in fin design but a real revolution. These new fins will give you more range, better upwind capability, great speed and complete control !