Our 11 oz. Matte Black Color Changing Mugs provide a fun and unique way to greet the morning. Our color changing mugs are heat sensitive and actually transistion colors to display your image when exposed to hot liquid. When the mug is cold, it appears matte black, but when coffee (or other hot liquids) are added, the matte black color magically reveals your chosen image. In some instances, chosen images may not be completely hidden and will have an overall matte black cast. These novelty mugs make great gifts for any occasion. These come in cases of 36 pieces.