Pour hot liquid into this Wacky Races Winners Lane Heat-Sensitive Morphing Mug and snickering Muttley appears with Dick Dastardly in the background, ready for a race. The exterior of this 11 oz. mug transforms from black as hot liquid is added, revealing the hidden image in full vivid colors. Makes a great gift for fans of the Hanna-Barbera series Wacky Races. Hand wash only. Not dishwasher safe. Do not microwave.