Zigfin Performance Surf Board Fins for 5 Fin / Thruster / Quad &hellip; 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 Bytes (single foil) + 6 Grub Screws + Promo Stickers "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 zigfin.com for riders & configurations