Features: Classic Design: This classic 9" fin has been tested for years to offer excellent balance of pivot and hold. The design of curve radian make it maneuverable for you to paddle on the SUP board and better control of direction and speed. Strong & Durable: Made of plastic and fiberglass-reinforced nylon, with marine grade stainless steel screw and plate which is strong and stiff, no need to worry about being corroded and rusted by seawater, it can be used continuously. This surfboard/SUP center fin with high quality and reasonable price is made to last. 1 Size Fits More: It fits more with 9 inches in depth, base width in 5.5 inches, and total weight with hardware of 10oz. This SUP fin is universally compatible. Suitable for Longboard, Surfboard, Stand-up Paddleboard with a standard 8.5" or 10.5" center fin box. Balance of speed, flow and response, suitable for all wave conditions, which it's a preferred choice for beginners and expert surfers. Easy to Install: With the "No-tool" screw, it takes just seconds to insert and remove the fins, you can install the fin on your board only in a few minutes. Optimal performance fin help you maximize your paddle boards performance Single fin keeps the board going in a straight line, the board will spin around if you don’t have a fin on your board. This Single Fin help eliminate unnecessary drag, maintain high stability and moderate control while you are paddling. Gain more fun and enjoyment by using the single fin on your surfboard The single fin provide stability, control, and predictability to your surfboard so that you can achieve smooth and easy performance in catching waves. Versatile single fin that suitable for Longboard, Surfboard, Stand-up Paddleboard with a standard 8.5" or 10.5" center fin box. Plastic and Fiberglass-reinforced Construction: Lightweight Strong and flexible Durable in use Easy to Install: Free “no tool” Screw Marine grade stainless steel screw Resist rust and corrosion