Strengthen Your Board - Made of high quality PVC with smooth surfaces and a matte texture, these fins are strong, wear-resistant and durable. Provides Stability and Control - The professional design supports buoyancy and water control, helping you maintain steadiness in varying conditions. Suitable for both beginners and experienced paddlers, it enhances maneuverability. Versatile Use and Compatibility - Replacement fins for paddle boards, kayaks or longboards with a retractable base. Built for high compatibility to deliver reliable rotation stability across different platforms. Easy installation - Quick and tool-free setup. Insert the fin into the fin box and tighten the screws to secure it. Use scenarios - Inflatable paddle boards in chop or windy conditions: improves tracking and stability, making it easier to stay on course. - Kayaks on longer paddling trips: enhances straight-line stability and maneuverability for better efficiency. - Longboards with retractable fins: provides smoother turns and reliable balance for confident cruising.