Diamond impregnated polishers for platinum and hard metal alloys. Polishers with synthetic rubber bond, grit diamond. Resistant, long service life, effective reduction/polishing. Use for trimming/reduction. smoothing/pre-polishing and high-shine polishing. Material composition platinum, titanium, stainless steel, palladium. Gray is fine grit. Please note, the first four styles pictured from left do not come with the mandrel as pictured.