saruSURF US box center River & surf SUP fin Safety Flex Soft 3" for SUP longboard airSUP Black SAFETY FLEX SOFT 3" FIN - under most conditions : impossible to break , 12 month warranty , we call the fin "findestructible" ! 8" long fin base if your fin box cavity is not 8" this fin will not fit PLEASE measure your fin box BEFORE you buy STAINLESS STEEL FIN SCREW saruSURF brand US box center fin, fin screw included, no need to screw drivers, adjust your in position (forward, backward, take it off) anytime even out on the water! 8" long fin base if your fin box cavity is not 8" this fin will not fit PLEASE measure your fin box BEFORE you buy FOR LONGBOARD , SUP AND INFLATABLE SUP ( inflatable sup boards with air7 fin box or US box - contact us to confirm if not sure) suitable for use with most longboard / (stand up paddle) SUP / airSUP. most long board and stand up paddleboards use the universal fin system, which can take this replacement fin. 8" long fin base if your fin box cavity is not 8" this fin will not fit PLEASE measure your fin box BEFORE you buy GREAT FOR BEGINNER AND KIDS : 1st time surfing can be dangerous, usually the fin is the sharpest part of you board, with this fin you can feel safer - the fin will bend and flex more and is harder to hurt yourself and others 8" long fin base if your fin box cavity is not 8" this fin will not fit PLEASE measure your fin box BEFORE you buy 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. This fin is flexible , in most conditions will not break, and less likely to break out your board's fin box! 8" long fin base if your fin box cavity is not 8" this fin will not fit PLEASE measure your fin box BEFORE you buy