Surfboard balance tool: ideal for adventurers seeking optimal stability and control on the water. Helps maintain balance and precise steering during paddling and riding. Replacement fin for inflatable paddleboard: made from safe plastic material, robust, wear-resistant and durable. Provides reliable performance and easy replacement for inflatable paddleboards. Replacement paddleboard fin: designed for broad compatibility, ensuring optimal fit with most surfboards, paddleboards, kayaks and fins. Paddleboard accessory: features an easy-to-disassemble design, enabling convenient transport and storage of the board and gear. Use scenarios: - On trips where a spare fin is needed to maintain tracking and performance on a paddleboard. - When upgrading to a universal fin system that fits multiple boards and kayaks. - While traveling, using the disassemble feature to pack the board and accessories compactly.