1" LONG TAIL FIN (10 inches long fin), low profile shape & directional tracking from the extended length tail, budget friendly, great shape fin with minimal flex to reduce harm to board and rider, others and still holds a lot of performance! (THIS IS NOT AN FCS FIN) FOR INFLATABLE SUP and SURFBOARD ( inflatable sup boards with CLICK FINS fin box - contact us to confirm if not sure) suitable for use with all brands using the Click Fins box (stand up paddle) SUP / airSUP. many leading board brands and stand up paddleboards use the universal Click Fins fin system, which can take this replacement fin. (THIS IS NOT AN FCS FIN) FITS ALL SUP BRANDS using the CLICK FINS style fin boxes (check image for exact dimensions) Please choose Color and Tri, Twin or Quad set! (THIS IS NOT AN FCS FIN) GREAT FOR SURFER AND ADVANCED SUP : gradual slope stiffened nose - slide over rocks easier, protects your fin boxes more: challenge white water, low level streams, river runs and fly fish in shallow lakes. OR lend it to a friend , with piece of mind knowing it's safer compared to fiberglass or carbon fin alternatives! (THIS IS NOT AN FCS FIN) COMPATIBLE WITH or WITHOUT fin grub screws Click Fins brand fin box, fin grub screws can be used to lock the fins even tighter when hitting high grade white water, adjust your fin set up any time (twin or quad, take them off) anytime even out on the water! semi-flexible tail to assist negotiating collisions when traveling backwards (THIS IS NOT AN FCS FIN)