3dRose mug_221887_3 Worlds Okays Brother In Bold Font Mug, 11 oz, NULL 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 A perfect gift for any occasion. Fascinate them every time by revealing a secret or surprise image A perfect gift for any occasion. Fascinate them every time by revealing a secret or surprise image