CAPTAIN FIN Future Fin McCallum Keel Fin These are large keel fins, so they provide good drive, but because they are angled in relation to the fin box (photo 15), they also offer good maneuverability. - Brand: CAPTAIN FIN CO. - Color: Purple - Type: Surfboard Fin - Size: Large - Design: Single Fin Please only purchase if you understand that this is stored, inspected, photographed, and packaged by an amateur. This is a used item inspected by an amateur. There may be damage that an amateur cannot detect, and we cannot guarantee performance during use, so nervous individuals should purchase a new item. Thank you for looking.