3dRose mug_91832_3 Canada Geese Bird, Ninepipe Wma, Montana Us27 Cha1722 Chuck Haney Magic Transforming Mug, 11-Ounce Fill with hot liquid to transform from black to white, magically revealing image White ceramic mug with black outer surface; image printed on both sides Microwave-safe, hand-wash to preserve image A perfect gift for any occasion, Fascinate them every time by revealing a secret or surprise image