The Silver Buffalo Warner Bros Harry Potter Hogwarts School Crest Cauldron 3D Sculpted Ceramic Coffee Mug. This detailed 20-ounce 3D sculpted mug is in the shape of a cauldron, and features the crest for Hogwarts School of Witchcraft and Wizardry - which displays the four Hogwarts houses: Slytherin, Ravenclaw, Hufflepuff, and Gryffindor. Constructed from BPA and toxin-free ceramic, NOT microwave-safe or dishwasher-safe; it's recommended that you hand-wash only. This Harry Potter sculpted mug is a great gift for any Harry Potter fans or Hogwarts School of Witchcraft and Wizardry students in your wizard life.