This Color Changing Cup is Usually Made of Aluminum Materials, These Materials Have Excellent Properties Such as High Temperature Resistance, Wear Resistance, Not Easy to Rust, & Will Not Cause Odor or Chemical Reaction to the Drink, Mesmerizing Color Changing Will Happen in These Cup. the Custom Pattern Cup Which is Colourful & Suitable for Family Dinner or Birthday Party Will Ensuring Your Family or Friend to the Happy Party Vibes! Aluminum Cup Have Several Advantages. First of All, Aluminum Material is Durable & Not Easy to Deform or Break. Secondly, Aluminum Material is Resistant to High Temperatures & Will Not Cause Harm to Human Health. in Addition, Aluminum Cup Are Easy to Clean Without Leaving Stains