All Revolution Series models will feature Polypropylene foam. Custom X developed M Core to provide a super stiff core material with lightweight properties. In addition, we add one or two of our graphite stringers depending on the size of the board. Top shaper/designer PMA has pulled out all the stops on these new models to provide high performance. Every part of the board was designed to work perfectly with the buoyancy of this core. From the rail angles, rail degrees, thickness, templates, tails, etc., every inch of each model is designed for today’s contemporary riding.