Type: Fins Fin System/Fin Box: FUTURES Number of Fins: Thruster Futures F4 Thermotech Thruster Surfboard Fins Material: Made of Thermotech (composite plastic), lightweight and durable. Design: Based on a template designed by Al Merrick. Performance: Thruster configuration provides balanced drive, speed, and responsiveness. Size: Designed for smaller riders or those seeking a looser, more responsive feel. Used for one season. Selling because I no longer use them. I don't think there are any major noticeable scratches, but please only purchase if you understand that this is a used item.