The Hobie Mirage ST Turbo Fin Kit upgrades the Hobie Mirage Drive with larger fins and fin masts to increase the overall fin surface area and overall performance by over 10 percent. These fins come standard on the Pro Angler and Island series, but are a worthwhile upgrade for other Mirage kayaks, especially those paddling for fitness or touring. Includes two fins, two fin masts, LocTite, and fin tension screws that allow adjustment of low end torque or top end speed.