Been riding these Rainbow Speedwing fins as a quad set-up in my trusty old 5'11 Zamora HP-Fish. Those little winglets break up the cavitation (unstable water at the tip of the fin). Serious speed and way less drag than w/ a standard front fin. Very stoked on how you can feel the difference, especially when pushing them hard. No wonder the commercial airlines use them. Saves fuel and increases speed.
(photos courtesy of rainbow fins)
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