Premium material: This SUP fin is made of nylon plastic with a smooth and sensitive surface treatment, is durable and robust and can be stably attached to the surfboard. It has good wear resistance and impact resistance. Exterior Design: Our inflatable surfboard fins have a snap-in safety reinforcement buckle, and the fin has a unique shape, the top end is shaped like a fin, and the streamlined appearance is the same as the physical one Water sports principles. This effectively improves the flexibility of the surfboard and can help you paddle safely. Convenient and Convenient: You can attach the fin base to the back of the surfboard first, then attach the fin to the base and insert a snap-in safety reinforcement buckle (the base for surfboard fins is not provided) if If you don't need the SUP fin, slide the SUP fin buckle to remove it. Suitable for most surfboards, e.g. paddleboards, inflatable SUP boards, paddle boards, stand-up paddle boards or canoe paddling. Best choice: Our kayak tracking fin increases the stability and balance of the surfboard and effectively reduces the effects of sea water when paddling, it is especially suitable to be installed on the surfboard for beginners, to stabilize the paddling.