Classic Design: This classic 8" 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. This fin fits standard US fin box. Be sure to measure and check the size before purchasing. 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 8 inches in depth, base width in 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 seconds. Abahub Warranty: we've been manufacturing fins for over 10 years. We know what we're doing and we stand by our products. If you're not happy with our products, we'll offer you replacement or refund with "No Question Asked" warranty. Abahub 8'' SUP Single Center Fin with 1 No Tool Fin Screw, Fiberglass Reinforeced 8 inch SUP Replacement Fins for Surfboard, Stand-up Paddle Board, Longboard, Black