Description: Surfboard Fin: The package content 1 surfing fin, a wonderful accessory for surfboards. The stand up paddle board fin is designed to ensure great compatibility with most surfboards, stand up paddle boards, kayaks or longboards with slider bases and are available on all types of surfboard brands and sizes. Premium Material: The surfing fin is made of high quality nylon material, wear resistant, strong and durable, and can be for a long time use. Features: This Surf fin designed with good workmanship, can adjust the sliding speed, and comes with a nylon strap to prevent loss and fall off. Easy to Install: Easy to install it in to kayak to divide the water and decrease the water resistance. It is easy to attach and remove without any tools. Wide Application: This Surfboard fin thruster is suitable for longboard, surfboard, and stand up paddleboard, provides good hold in both flat waters paddling and turning around. Size Chart: Sliding in Large Fin: 18.5cmx3cmx21.5cm/7.28inchx1.18inchx8.46inch A Pair of Small Fins: 21cmx6.5cmx6.5cm/8.27inchx2.56inchx2.56inch Sliding in Fin with Base: 18.5cmx3cmx21.5cm/7.28inchx1.18inchx8.46inch Base: 24.5cmx11.5cm/9.65inchx4.53inch Package Includes: 1 Surfing Fin Note: Please allow slightly errors due to manual measurement and different monitors.