3dRose 14, 610 Days Together But Whos Counting Happy 40th Anniversary, Magic Transforming Mug, 11-Oz 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 11 oz. 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 Microwave-safe, hand-wash to preserve image