K4 Flex Slot Box Pair of Rear Fins for Windsurf Board Twinsers & Quads

K4 Flex Slot Box Rear Fins for Windsurfing Boards

SOLD AS PAIRS. These are perfect for use as ‘twinsers’.

“Our original fin for performance wave riding. Lots of flex for amazing grip and looseness on the wave. Raked template for control. A progressive foil for different flows between tip and base. Test winner. Will loosen up a ‘stiff’ board and are particularly sweet as twin fins as they eliminate that unwanted top turn spin out.” – K4 Fins