Coral Espresso Cup 9cl/3oz (Pack 6) Porcelain Body - Visually appealing, pure white porcelain that is impervious to water, making it craze proof and very hygienic. Glaze Finish - Resistant to stains, metal-marking and abrasion in normal usage. Microwave and Dishwasher Safe - All plain white products are resistant to attacks by dishwasher detergents and are completely safe in any microwave oven. Durability & Strength - Porcelite is inherently strong vitrified porcelain that far exceeds European guidelines for catering ceramics (BS4034). Freezer Safe - High durability to resist sudden changes in temperature.