ITEM NAME:Longboard Surfboard Surfing Fins Thruster for Future Base Black Description: Made of qualified PVC and PVC rubber with great durability, lightness and flexibility. Universal: suitable for Future base. The longboard/shortboard/ fun board surfboard fin seamlessly connects turns and allows surfers to move up and down the board. This versatile fin is designed for all.The longboard/shortboard/ fun board surfboard fin seamlessly connects turns and allows surfers to move up and down the board. 1 Piece Surfboard Fin. Universal: suitable for Future base. Fast reacting fin for performing tight radius turns.