3dRose mug_43381_3"Gratulerer med dagen, Golden Morning, Happy Birthday in Norwegian" Magic Transforming Mug, 11 oz, Multicolor 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 Available in 11oz only; A fun and unique way to enjoy your favorite hot beverage A perfect gift for any occasion; Fascinate them every time by revealing a secret or surprise image Not microwave-safe, hand-wash to preserve image