Using these Heroes of Goo Jit Zu S11 Minis is super easy. Just grab the hero or villain figure and start stretching it up to 4 times its size to get ready for an epic battle. You can pair the hero with the villain in each pack and imagine all kinds of exciting fights. When you're done playing, simply let the figure go back to its normal size. As for maintenance, keep them away from sharp objects to avoid tearing the goo material. If they get dirty, you can gently wipe them with a damp cloth. Remember, these are assorted items, so you might get different styles at dispatch. If you have a favorite, add a note in your order. They're suitable for kids aged 4 and up, so make sure younger kids play under adult supervision.