Especially we do not surf with the 5 fins at the same time! Designed so that one can adapt to surf according to the conditions. Switch freely from a quad-mount thruster assembly. For more speed and a higher hold on the wave, opt for the quad. Conversely, if you prefer more stability and better control, then opt for the thruster. For short, if you have the option to have a 5 end set, then go ahead.