Hot Wheels Colour Reveal 2-Pack in CDUThe Hot Wheels colour Reveal 2 Pack of vehicles is loaded with awesome surprises! Inside the barrel drum are two 1: 64 scale Hot Wheels colour Reveal cars covered in special colour Reveal coating. For the initial reveal, fill the drum with water and swirl each car around in it until the water changes colour, the pull the car out the sweet decos hiding underneath are exposed! Want to change its appearance again? Fill the drum with cold water and dunk