3dRose Londons Times Funny Cat Cartoons - Cat Airline Pilots - 11oz Magic Transforming Mug (mug_2904_3) 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