Check the listing for details. Surfboard Fin Paddleboard Fin Paddle Board Fin Reinforced Universal Replacement. Color: Black, Condition: New. Listed at 21.00 USD. 【Easy to Install】: Our paddleboard fin is easy to install to kayak to divide water and decrease water resistance. It is easy to attach and to remove without any tools. 【Wide Application】: The paddle board fin is suitable for longboard, surfboard, and stand up paddleboard, and provides good hold in both flat water paddling and turning around.