SIZE: This mug has a capacity of 15 ounces, so you can have plenty of your favorite hot drink. It's recommended for ages 13 and up. MATERIAL: The color changing mug is made of ceramic, so it holds heat well to keep drinks warm. Hand wash only and do not microwave. COLOR-CHANGE DESIGN: This unique mug changes color when filled with a hot drink, revealing brand new artwork! COLLECTIBLE KEEPSAKE: The ceramic mug makes a wonderful keepsake as well as the perfect birthday or holiday present for any fan. LIFESTYLE: The House of the Dragon coffee mug has a classic, enduring design. It can be used every day for your favorite hot drink or put on a shelf to admire.