The product is the ScubaPro Twin Jet Max Fins in Black Blue - Size Small (6-8) Brand New and never used! Patented Split-Hydrofoil Shape: The Twin Jet Max Fin has a unique split-hydrofoil shape that offers optimal power with minimal effort, enhancing maneuverability and diver comfort. Spring Strap System: The new spring strap system allows easy and quick slipping on of the fins without adjustments, ensuring the fin stays snugly and comfortably on the foot. Power, Efficiency, and Fit: The fins are designed to move more water, providing greater kicking power and efficiency by transferring a higher percentage of the diver's kicking effort into forward motion. Advanced Propulsion Technology: SCUBAPRO split fins use an innovative hydrofoil shape that generates forward motion with less effort, featuring a patented design that allows water to flow between and around the twin blades for seamless propulsion.