FCS II Carver PC Thruster Fins - Black These thruster fins are designed for drawn-out, powerful turns. Their design further allows for added hold, with the elongated template and high degree of sweep. This creates exceptional hold off the bottom and when the surfer is carving on the open face. For power surfers aiming to push hard against their fins and draw out their turns, these fins are ideal. Ideal conditions - Long down the line waves, open face, in particular these fins work best in point and reef breaks. Board Types - Designed to fit the FSC II System and boards with moderate to extreme rocker and deep concaves. Fin Group - Carver, create power, drawn-out turns and added hold.