These autoclavable silicone polishers have a long track record and are well known for their efficiency and durability, Recommended average speed for Brownie, Greenie & SuperGreenie Polishers: 5,000 to 7,000 rpm (maximum speed of 30,000 rpm), Provides fast, brilliant results without pumice or tin oxide, Cups are for proximals and mini-points are for occlusals, Brownies for pre-polishing, Greenies for polishing, Supergreenies for super-polishing, Contra-Angle and Friction-Grip kits, Your choice of a sterilizable bur block or plastic kit, Use Amalgam Polishing kit for:, amalgams and precious alloys