The FCS H4 Accelerator template is purpose built for performance shortboards with moderate-to-low rocker. The side fin's lower section produces maximum acceleration, while the hatchet like tip creates stability and control. The center fin's elliptical outline reduces drag, and offers feeling of predictability when releasing through turns. Swiss engineered and made from high density uni-directional carbon fibre, this template is designed to be light and super strong with custom orientation to transfer more of your energy into speed than any other fin.The side fins have a 4.36" base and 4.34" depth. The center fin has a 4.29" base and 4.49" depth.