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! 14 oz. | 350 mL 14 oz. | 400 mL • 14 oz. Ceramic coffee cup with a comfortable handle. • All of our mugs come in a beautifully designed, colorful box. • UPG is a novelty gift company specializing in smart and funny gifts. Check out our shop for all types of quirky fun stuff! Perfect for any hot beverage: coffee, tea, hot chocolate.