THE DYNAMI-TECH CARBON FIN BLADES have been specifically engineered for CETMA S-Wing Footpockets. The S-Wing Footpockets are sold separately and also available for purchase. These high end carbon blades are the result of Cetma Composites engineering approach to the development and manufacturing process of freediving and spearfishing fins, coupled with years of material studies and experience in the design of composite materials for the aerospace and automotive industries.