Using these Schylling Color - Changing Revealeons is easy and fun. To see the color - changing magic, simply put them in warm water or hold them in your warm hands. They're great for bath time, just drop them in the water and watch as they transform. For playtime, squeeze them and feel their squishy texture. As for maintenance, you can just rinse them with clean water after use. Remember, these are sold separately and the styles are randomly selected at dispatch. If you want a specific style, leave a note in your order. And if you're really particular about the style, it's best to visit your local Toyworld store. They're suitable for kids aged 3 and up, so keep them away from younger children to avoid any choking hazards.