Biolite 3 Core 3-Stage Rocker Dual Concave Base Soft Landing Spine Forgiving Rail Profile: Beveled Edge between Bindings The Sender is available in 4 sizes so everyone can ride what JB does. Designed with a 3-Stage Rocker, the Sender supplies a great pop off any wake size. The Dual Concave Base channels water for additional speed and control. A forgiving ride was JB’s goal, beveled edges between the bindings and a Soft Landing Spine ensure this. The Sender will also set an aggressive edge on approach to the wake with cupper rails and tip & tail. Including the Remix open toe binding, this is a perfect package for your wakeboarding adventure.