Dynabrade 56890 Non-Vacuum Dynorbital Supreme Random Orbital Sander, 6-Inch 152mm Diameter Non-Vacuum Dynorbital Supreme includes low profile, premium urethane weight-mated sanding pad Supreme models run at 12,000 RPM, composite rotor is stronger and has better lubricating qualities, enabling blades to last longer Composite base has integrated rubber over-mold creating a non-slip feel, as well as insulating from cold