For hard alloys. These silicone polishers contain high- quality abrasive materials for polishing hard palladium, nickel-chrome, and cobalt-chrome alloys. Use the Hardie Black for final adjustments and prepolish, and the Hardie Brown for polishing. (For superpolish, use our Greenies and Supergreenies.) Most of the shapes come 12 pieces to a box. *BP1 comes 6 pieces to a box.