The surfboard fin is made of high quality nylon material, tough, wear-resistant, durable. Detachable Center Fin: Our center fin has a clip for attaching/detaching to the fin dock Slide and lock fin box system makes it ?removable center fin for inflatable paddle boards. High Performance: The surfboard fin can increase the stability of the surfboard to keep you safe when surfing.Detachable and adjustable design is easy to install and use, and can meet your various needs. Wide Application: The Surfboard Fin is suitable for various kinds of inflatable surfboards, like longboard / surfboard / stand up paddle board. Description:The surfboard fin is of high strength and durable , delivers outstanding pivoting and guiding performance, and can keep you at good balance when surfing and paddling. It suitable for various kinds of inflatable surfboards, like longboard / surfboard /stand up paddle board. Specifications: Item type: Surfboard fin Material: Nylon Color: Black size:5.5inches,8inches,11inches Weight: 300g Package Includes:1 * Surfboard Fin1 * Fin Base Note: Because it is manual measurement, please understand that there will be an error of one to two centimeters. thanks.