AK Fin AK6 Hex Core ThrusterThe AK6 Hex Core is a drive orientated fin with incredible low end power and engineered tip flex, optimizing high end control. The Hex Core reduces weight and works in conjunction with the engineered flex. Front Fins: Height: 4. 59 Base: 4. 4 7 cant Flat Foil Center Fin: Height: 4. 62 Base: 4. 39 Ideal Board & Conditions: Performance down the line thruster, perfect for clean medium sized surf. Flex Rating: Medium stiffness for good hold in bigger