Harry Potter or Nightmare Before Christmas 4-Pk. Color-Changing Tumblers bring a touch of enchantment to your kitchen table while making hydration exciting for the whole family. Whether you choose the Hogwarts or Halloween Town, these collectible cups instantly transform when you add ice-cold water, revealing vibrant colors that delight fans of all ages. This engaging feature encourages even the pickiest eaters to drink more water during meals or snack time. Perfect for daily use or keeping on a shelf as a unique collectible, this set offers both practical function and whimsical style at a great value.