FCS - FCS II Aipa Performance Glass Twin Fin with StabiliserAkila Aipa's Specialty Twin + 1 set, designed to suit his unique board templates. This high area Twin was built to be pushed hard through turns with a centre fin for added control. I have put about five years into this fin, as far as tweaking it to get it where I wanted. It has a medium base and medium surface area but is more upright and has a thinner tip which will offer you pivot on the face and the pocket, while still giving you stability and