HotWheels 6 Color Shifters Toy Cars including 1 Monster Truck! These color-changing toy cars are lots of fun for kids, just put them in warm water to see the colour change and then back into cold water to turn them back to their original colour. You can dunk half the car in or even make a diagonal line of colour on it. Then you can use the cars on your favourite Hot Wheels Car Track! We unbox the following cars: Baja Breaker, Dodge Charger SRT8, Monster Dairy Delivery, What 4- and the 55 Chevy Panel.