TK43SW Freestyle-Wave Rear Fin (Single)is designed to take anything you throw at it! Waves, Freestyle, Bump and jump or just blasting fully powered, the 3SW has the power and control to not let you down. Plug one into your wave board for a boost in onshore slogging conditions. Flex: Stiff Sizes: 18cm, 20cm, 22cm, 24cm, 26cm, 28cm, 30cm, 32cm US and Power Box Heads