Premium material: This SUP fin is made of nylon plastic with a smooth surface treatment, offering durability and robust performance. It provides excellent wear resistance and impact resistance for reliable use. Exterior Design: The inflatable surfboard fin features a snap-in safety reinforcement buckle and a uniquely shaped design. The top resembles a fin with a streamlined appearance that aligns with hydrodynamic principles of water sports. This enhances the flexibility of the surfboard and supports safe paddling. Convenient installation: Attach the fin base to the back of the surfboard first, then secure the fin to the base using the snap-in safety reinforcement buckle (fin base not included). When not in use, simply slide the buckle to remove the fin. Compatible with most surfboards, including paddleboards, inflatable SUP boards, stand-up paddle boards, and canoes. Best choice: This kayak tracking fin improves surfboard stability and balance, reduces drift caused by water currents, and is ideal for beginner riders seeking enhanced control during paddling.