Inside the barrel drum of the Hot Wheels Colour Reveal 2-Pack are two 1:64 scale Hot Wheels cars covered in special Colour Reveal coating. For the initial reveal, fill the drum with water and swirl each car in it until the water changes colour, 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 in very warm water. Alternate between icy cold or very warm water to repeat the colour shift. The barrel drum doubles as a Hot Wheels dunk tank, and it's also perfect for storage! Each two-pack is sold separately, subject to availability. Styles, colours and decorations may vary.