hot wheels color reveal two pack cdu hbn63 en gbInside the barrel drum of the Hot Wheels Color Reveal 2 Pack are two 1: 64 scale Hot Wheels Color Reveal cars covered in special Color Reveal coating. For the initial reveal, fill the drum with water and swirl each car in it until the water changes color, then pull the car out to reveal its sweet deco. To change its appearance again, fill the drum with icy cold water and dunk it in for yet another awesome transformation! Change it back by dunking it