Bladed spokes on drive side, regular on other side
Your first, and possibly best, place to start researching is the Cannondale website.  It appears that 2 models of the Synapse, the Synapse Carbon Disc Ultegra and Synapse Carbon Disc Ultegra DI2 come standard with Mavic Aksium Disc wheels.  You could then refer to the Mavic website to get the specs on those.