Zirconia has three important property advantages compared to alumina: higher impact strength, higher hardness, and the ability to be honed to finer surface finishes. All three of these property advantages translate to lower ownership costs. The improved wear directly extends the service life of the sleeve, while the improved impact strength cuts down on the significant costs of replacing broken liners in the field. The surface finish improvements meanwhile have an indirect effect. The finer surface finish means less friction with the elastomer-and-metal pump pistons, which in turn extends piston life and reduces pump-cooling requirements. We can supply liners from 4-1/2″ to 7″ for all popular OEM Mud Pumps.