Wishlist FCS FCSII Reactor | Thruster 3 Fin Set | Performance Core Carbon | Top of The Range | Impressive Turns and Tail Release $169.95 FCSII Reactor | Thruster 3 Fin Set | Performance Core Carbon | Top of The Range | Impressive Turns and Tail Release Essential Series FCS 2 Reactor surfboard fin template is fast reacting surfboard fin set for performing tight radius turns. Smaller... Choose Options Compare