Romantic Valentine's Day Gift - 11oz You're My Favorite Best Choice Color Changing Mug Morphing Coffee Mugs Cup, Awesome Romantic Gift Mug for Best Friend/Lovers/Husband/Wife 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