Thank you for viewing. This is an FCS2 Christenson Fin 8.5. Designed by Chris Christenson. Inspired by the Greenough 4A. It's designed with a stiff base for drive and less flex, and a more flexible tip for agile response. It's convenient as it only requires you to insert the fin straight into the box, with no tools or fin bolts needed. Perfect for mid-length boards. Size: 8.5 inches Base: 15.5cm Height: 21.5cm Accessories: None Purchase price: ¥16,500 Condition: Brand new, unused. I purchased a different fin, so it's unused and stored indoors. If you have any questions, please comment and I will answer. Type: Center fin Fin system/Fin box: Center fin box Number of fins: Single fin