These mugs are super easy to use. Just pour your favorite hot or cold beverage into the 350ml mugs. They're microwave - safe, so you can heat up your drink without any worry. When it comes to cleaning, use mild dish soap and warm water. Don't use abrasive sponges as they might scratch the surface. Keep them in a dry place to maintain their spooky charm. Enjoy sipping your drinks with these fun mugs!