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So you let your cousin Jimmy borrow your Plank and somehow he managed to break off the fin? Don't be mad, be impressed -- that's no easy feat! You still need to replace it though, so pick up the Catch Surf 9" Plank Replacement Fin and restore your board's down-the-line stability.
Compatibility – Catch Surf Plank Single Fin Surfboards
9" Performance Single Fin