I Love My Awesome Hot Wife Color Changing Mug Morphing Coffee Mugs Cup - 11oz sizes, Awesome Romantic Gift Mug for Lovers/Wife/Valentine's Day Holds 11 Ounce Magic Heat Sensitive: Just plain black in color when it's cold,mug will turn white and reveal Design only when filled with a hot beverage New design, novelty, funny Sturdy and durable Awesome Gift Idea