Twenty five years after designing the thruster, Simon Anderson, one of the most influential surfer/shapers in history and innovator of the thruster, is producing quads. These FCS Quad Surfboard fins are for his small wave quad boards and serve as a true evolution of his S81 template. A very upright right fin for quick direction changes. More base and more curve in the leading and trailing edges makes for tighter turning characteristics that better suit performance surfing. Both the front and rear fins have proportionally the same outline resulting in superior handling, speed and control. The Medium template will suit small to medium surfers while the Large template will cater to larger surfers. Simon has now produced a quad fin that is sleek and proven to perform.