The 4.6-Inch Unbreakable Removable Center Flex Fin is a center fin compatible with any U.S. fin box. This fin comes with a Fast Fin Release System, which holds the fin in place with just a 90-degree twist of the system.  To remove the fin, simply turn the Fast Fin Release System 90-degrees, and slide fin out of the track. 

This fin’s flexible nature allows it to stay true to form, but keep a straight line while paddling, and it is 100% unbreakable, withstanding contact with rocks and the seafloor.