7" Minimal FLEX PLASTIC fin (17.8cm , 50-50 foil), budget friendly, great classic dolphin / surf shape fin with minimal flex to reduce harm to board and rider, others and still holds a lot of performance! 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. FITS ALL SUP BRANDS using the CLICK FINS style fin boxes (check image for exact dimensions) GREAT FOR SURFER AND ADVANCED SUP : surf dumping shore breaks, shallow reefs. On your SUP : 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! 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!