1.Material:99% Alumina 2.Wear resistance, 3.High mechanical strenght 4,Custom design 5,Eco- ... price FeatureAlumina Ceramic has the advantages of super hardness,high wear-resisting,good corrosion resistance ,high temperature tolerance,precision process, high mechanical ... Roughness, Concentricity, Perpendicularity and other specification are upon your requirements. Wear-resistant Alumina ceramic ring