... strenght 4,Custom design 5,Eco-friendly,favourable price FeatureAlumina Ceramic has the advantages of super hardness,high wear-resisting, ... pressure cleaner. 3,Wearlessness,resistant acid-base and high intensity ceramic assembly apply to petroleum ,chemical and chemical industry. 4, ... Concentricity, Perpendicularity and other specification are upon your requirements. Alumina ceramic small ring