The fins are made of upgraded reinforced nylon（Nylon + Glassfiber）, which is extremely rigid and flexible. It provides you with high stability and balance while enjoying surfing, there is no need to worry about it breaking or being damaged. With it, you can easily control the direction and speed, enjoy the feeling of freedom. Easy to Install: Different from the traditional similar products, our fin adopts a practical and user-friendly design with a quick-release detachable system. It is very easy to install. It can be slid in and easily fixed within a few seconds. No screws or any tools are required. Easy to carry. The Best Choice: Our sup fins adopt advanced structural design to achieve a balance of speed and direction, and provide absolute stability when you paddle or turn around. Suitable for users of all levels, both professional paddle surfers and beginners., Manufacturer: SOYWIM