Silicon polishers are very flexible and ideal for preparing rough surfaces for additional finishing as well as final finishing on many types of metals. They are especially desirable for use on prongs, bezels, and other metal surfaces that are close to mounted stones since they will not harm them. OPTIMA® polishers are the result of years of research and testing on many types of metals for quality, performance, and long life. They are available in different grits for all phases of polishing. Made in Germany.