A "spine" for your Advanced Elements inflatable kayak! The Backbone is inserted under your floor cushion while your kayak is deflated. Once the kayak is pumped up, the backbone creates a bow-to-stern frame which enhances performance and rigidity; while the bow-to-stern beam is straight, the side-to-side silhouette has a slight v-bottom. Four different models. Features include: Aluminum shaft with rubberized foams; Strong plastic paddles 4 to 5 pc breakdown construction - fits in the carrying case Enhances performance and rigidity Weight 4 lbs Length 114.5"