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Postato il 10/18/2020 : 06:58:59 Duratec 80% alumina ceramic ball is a kind of high-quality grinding medium, which is made of high-quality materials.Duratec 80% zirconium alumina ceramic ball contains 2% - 3% zirconium content. The strength of alumina ball is greatly improved by adding zirconium.http://www.duratecceramic.com