Devices are disclosed for the high speed centrifugal casting of one or more spheroids. One or more hollow spherical molds are each caused to rotate at high speed about two substantially perpendicular axes intersecting at the center of the mold. Where the mold is partially filled with casting material, a hollow spheroid having walls of even thickness results. Where the mold is filled with multiple casting materials with different densities, the resulting spheroid will have a core that is less dense than its outer layers. Such spheroids are useful as sporting goods, bearing balls, insulation material, and in numerous other applications.