Features: Highly polished foot enhances stackability to optimize storage. Durable, fully vitrified, twice fired porcelain helps reduce replacements. Pronounced underside rim makes dinnerware easier to grip. Lifetime No-Chip Warranty. The first-ever porcelain dinnerware with built-in Microban technology. How it works: Microban technology is integrated into the fully vitrified glaze, for an additional level of defense that will never wash off. This advanced silver-based technology creates an inhospitable environment for microbes to help prevent them from growing on the surface.