The surfboard fins are made of high quality nylon material, tough, wear resistant and durable. Removable central fin: Our center fin has a clip to attach/detach the fin dock. The sliding and locking fin box system makes it a removable center fin for inflatable paddles. HIGH PERFORMANCE: Surfboard fins increase the stability of the surfboard, keeping you safe while surfing. The removable and adjustable design is easy to install and use to meet your different needs. Wide range of applications: Surfboard fins are suitable for all kinds of inflatable surfboards, such as longboards/surfboards/stand-up paddleboards. Description: Surfboard fins are very strong and durable, with excellent rotation and guiding properties for good balance while surfing and paddling. It is suitable for all kinds of inflatable surfboards, such as longboards/surfboards/stand-up paddleboards. Specifications: Item Type: Surfboard Fin Material: Nylon color: Black base size: Approximately. 11.5 * 24.5cm / 4.53 x 9.64inch Approx. 3.5 x 18.5 x 21.5 cm / 1.38 x 7.28 x 8.46 inch 300g package includes: 1*surfboard fins 1*finbase