Futures Performance Single Fin • 2024Choose your weapon. The Futures Fins Performance Single Fin offers a solution for every set up. The 4. 5" is the standard thruster center fin, with a 1 Shot Box base. The 6", 7" and 8" are different size 2 + 1 center fins sized at 1" increments, to allow for customizing your set up. The 9" is the single fin version, providing enough fin area for that traditional longboard feel. Fin Size Detail Size Height Base Area Foil 4. 6" 4. 5" 15. 30" Symmetrical