METTY 14 oz Double Wall Ceramics Insulation Coffee Mug & Ceramics Spoon Bottler Cup Black 14 oz Double Walled Ceramics Insulation Coffee Mug & Ceramics Spoon Double-walled porcelain construction insulates hot and cold beverages. Safe to clean in the dishwasher and to warm in the microwave. Great gift idea, minimizes the waste of coffeehouse paper cups Lots of possibilities for practical use or just being funny.