This Rudder Kit will fit all 2018 Castine models. The aluminum alloy used in our rudder can take lots of abuse, bending, and re-bending 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.