The KYMA softboard fin set is a great way to add control to your surfboard, longboard, or standup paddleboard. Super Flex is a Pro Teck fin with a soft flexible core and soft edges making it the ultimate safety fin for beginners, surf schools, and board rentals. Super Flex Fins are also for the surfer who wants a fun, very easy turning and forgiving fin. KYMA 4.5″ softboard fins mount through pre-drilled holes and are suitable for beginners to professional surfers.