Nova Wheels by Diamond Pacific With Nova Wheels, sanding and polishing stones doesn't have to be a tiresome battle with flat spots and scratches. Nova Wheels get results fast. The diamonds are embedded within a tough, flexible plastic resin and backed by soft, thick rubber. This soft, flexible construction enables the surface of the Nova Wheel to conform to your stones, eliminating flat spots and scratches. Must be used with water. Nova Wheels have 1" arbor holes, and no longer come supplied with bushings. The two, and four inch diameter wheels take one 1"" bushing. The six inch diameter wheels take two 3⁄4" bushings and the 7 5⁄8" wheels take two 1” bushings.