Get quick and professional results with 3M radial bristle discs. They feature a unique, three-dimensional abrasive/flexible bristle design that provides a uniform finish. Use them for heavy cleaning, for removing firescale and light oxidation, and then for complete polish cycle . Discs provide the convenience of a built in abrasive that doesn't generate the heat associated with classic rubber wheels.• Remove oxides from jewelry without using messy compounds.• Clean and maintain hard-to-reach areas and fine detail.• Embedded cubitron mineral abrasive is much harder than most metals.• Recommended handpiece speed is 15,000rpm; maximum is 30,000rpm.You should work from lowest grit to highest grit for high polish***Always load no less then 3 and nor more then 6 on mandrel