This Rudder Kit will fit all 2018 Castine models. The aluminum alloy used in our rudder can take lots of abuse, bending, and rebending before it breaks. With some care this aluminum rudder should last a lifetime. When deployed you use the foot pedals to guide the kayak to the right or the left. A rudder is used for keeping your boat on track, especially when the weather conditions change. It can help make your journey safer and more enjoyable.