Using the Hot Wheels Advent Calendar is easy. Just open one numbered door each day as you count down to the holidays. You'll find cool 1:64 scale Hot Wheels vehicles and fun winter - themed accessories. Use the playmat on the side of the box to set up exciting scenes with your new items. As for maintenance, keep the cars and accessories in a dry place to avoid damage. If they get dirty, you can gently wipe them with a soft cloth. Note that the colours and decorations on the calendar may vary, so each one is a bit unique.