Thank you very much for viewing! We offer high-quality fiberglass fins! [Product] Twin Fin Material: Fiberglass The glass creates strength and flex. These fins are highly recommended for those seeking quick take-offs and dynamic turns. The combination of black and red is cool! They match fish boards! For those who purchase a fin keyholder at the same time, we will include a keyholder in your favorite color for an additional 700 yen. Please let us know in the comments beforehand.