FCS Chilli-9 Glass Flex Surfboard Tri Fin Set - Gray The Chilli-9 is a high performance fin developed by James 'Chilli' Cheal Tested by some of the world's best surfers The longer base and reduced sweep angle offer superior speed and drive without sacrificing maneuverability Glass Flex has been formulated to replicate the flex and memory properties of a fiberglass fin Delivers a stiff, more positive flex pattern (nice tip flex, little base flex) with remarkable flex memory