This heat-transforming mug reveals Busytown favorites (Lowly Worm, Officer Flossy, Mistress Mouse) inside the vehicles when hot liquid is added. Cold: tinted windows. Hot: surprise characters inside! 

Product Details:

• 14 oz. Ceramic coffee cup with a comfortable handle
• Comes in a beautifully designed, colorful box
• Heat activated color changing mugs are microwave safe, but not dishwasher safe
• Hand wash only. Don't soak.