The Hot Wheels Monster Trucks Color Reveal trucks pack awesome surprises! Inside each barrel drum is one 1:64 scale Hot Wheels Color Shifters Monster Truck that's covered in special Color Reveal coating and a clip-on water tank. For the initial reveal, fill the drum with water and swirl the truck around in it until the water changes color, then pull it out to reveal the Monster Truck and its deco! Want to change its appearance again? Fill the drum with icy cold water and dunk it in to watch the colors magically change! Change it back by dunking it in warm water! Use the clip-on water tank to spray oncoming Color Shifters trucks with deco-changing water for an epic water battle. Kids will want the entire collection.