Want to go really fast? Add TURBOs to your MirageDrive 180. With the MirageDrive 180 Turbo Fin Kit, get to speeds you haven't experienced before. The Square Tip fin is designed for efficiency so fewer pedals are required per mile. Sailing upwind just got a lot easier. Now you can count on maximum power in both forward and reverse. Kit includes: 2 Turbo fins and 2 Turbo fin masts.