Zigfin Performance Surf Board Fins for 5 Fin / Thruster / Quad... FCS Compatible Six Pack FCS & FCSII Compatible Fin System for shortboard, longboard, kite surf, wake surf, stand up paddle board, & tow in. 2 Centre Drive Fins (double foil) + 4 Side Byte Fins (single foil) + 6 Grub Screws + Promo Sticker "One of the most important rules in the surfboard fin manual is that there are optimal fin setups for different wave types. Yes, you can - and you should - adjust the feel of your board to different waves." - Surfer Today Check out zigfin.com for riders & configurations