Ceramic ring (ZrO2) is mainly used in homochrome or polychrome transfer printer that adopts ink-cup system. Because of the outstanding features that advanced ceramics owns, the sealing performance and vibratility of ceramic ring are much better than that of alloying rings. Ceramic ring has the advantages of abrasion-resistance, corrosion-resistance, high intensity, heat-resistance, etc. and greatly increases the service life of the edge of ink-cup.