The O'Brien Siege Slalom Water Ski is a speedy and stable ski for the intermediate to advanced rider looking for performance and to have fun. The Tunnel Concave offers quick and easy turning as well as amazing tracking and a Rocker Pattern that makes for super smooth transitions edge-to-edge. The Bevels are small making for faster easier turns. With the X9 Bindings, you'll have bindings ideal for everyone. They're adjustable and lightweight as well as flexible. The O'Brien Siege Bindings have an EVA footbed for comfort and are easy to release when you're done for the day. The whole family will enjoy their time on the boat and on the water when they're riding on the O'Brien Siege Slalom Water Ski. Binding Size: 7-11, Carve Fin, Smooth Transitions, What Binding is Included?: Avid, Binding Arrangement: Fixed Front-Open Back, Fin Type: Aluminum, Ski Width: Traditional, Skill Range: Advanced Intermediate - Advanced, Model Year: 2019, Product ID: 505319, Model Number: 2180484, GTIN: 0730918945253