Type... Fins Fin System/Fin Box... FUTURES Number of Fins... Thruster Futures F4 Thermotech Thruster Surfboard Fins Material: Made of Thermotech (composite plastic), which is lightweight and durable. Design: Based on a template designed by Al Merrick. Performance: Thruster configuration, providing balanced drive, speed, and response. 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 believe there are no particularly large or noticeable scratches, but please understand that these are used items before making a purchase.