AQUBONA MACHADO KEEL FCS2 surfboard fins. I believe these are for a twin setup. This is the right-side fin, with the bottom facing up. As shown in the red circle in the first photo, the tip is slightly chipped, and the edges have been lightly smoothed with sandpaper. - Brand: AQUBONA - Model: MACHADO KEEL - Size (Width): Approximately 23 cm - Size (Height): Approximately 12 cm Price negotiations are not accepted. Thank you for your understanding.