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 unique shape with a fin-like top end. The streamlined design follows hydrodynamic principles to enhance board flexibility and improve paddling control. Convenient use: 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 release the buckle to remove the fin. Compatible with most surfboards, including paddle boards, inflatable SUP boards, stand-up paddle boards, and canoes. Best choice: This kayak tracking fin enhances board stability and balance, reduces drift caused by water currents, and is ideal for beginner riders seeking improved tracking and control while paddling.