It is a tracking fin suitable for most Kayak boat to divide water and decrease the water resistance. Features: Lightweight and portable to carry. High quality material, strong and durable. It is a tracking fin suitable for most kayak boat. It is installed to kayak to divide water and decrease the water resistance. It is simple to attach with glue.(Glue is NOT included) Specifications: Material: Rubber Size: As the picture shows Weight: 339g / 11.96oz Package Size: 29 * 23.5 * 11.7cm / 11.42 * 9.25 * 4.61in Package Weight: 343g / 12.1oz Package List: 1 * Tracking Fin Notes: 1, Please allow 1 - 2cm (0.4 - 0.8") differences due to manual measurement, thanks.