Using your Teamsterz Color - Changing Car is super easy! First, if you want to see the color change, just put the car into warm water. You'll watch in amazement as it turns into a different color. When you want the original color back, dip it in icy - cold water. These cars are made of high - quality die - cast material and have free - moving wheels, so they're great for play. Remember, the styles are chosen randomly when we send them out. If you like a certain style, tell us in your order notes, and we'll try to pick it for you. Each car is sold separately. To keep your car in good shape, avoid rough play that could damage the die - cast body. Also, don't leave it in water for too long to prevent any potential rust or damage. Have fun with your Teamsterz Color - Changing Car!