KONA SURF CO. Classic Single Single Center Fin for LongboardThis classic fin template is proven to be an excellent fin for most longboards and SUPs. The medium build and rake make this fin great for added control and easy paddling, turning and noseriding. Fits most standard 8in to 10in fin boxes for surfboards and paddleboards and is available in many fun colors. You can get a black fin or choose one of our colorful designs to customize your board. These fiberglass fins have excellent flex and durability