... 5,Eco-friendly,favourable price FeatureAlumina Ceramic has the advantages of super hardness,high wear-resisting,good ... our product 1, Ceramic shaft for aquarium equipment filter pump 2, Ceramic plunger for high pressure cleaner. 3 ... me.Dimension, Tolerance, Surface Roughness, Concentricity, Perpendicularity and other specification are upon your requirements. Alumina ceramic pump sleeve and shaft