FCS II Reactor Performance Core Thruster Fins - White EditionThe FCS II Essential Series White Edition brings timeless style to proven performance. Reactor Beach Break Designed for speed and tight turns, with added tail release, the Reactor fin is an upright template that allows for tighter, more acute directional changes in beach break conditions. The Reactor features a smaller centre fin for increased pivot and tail release and is ideal for surfers who like to perform fast and progressive turns. FCS II White