LANDUSA Creative Disappearing/Reappearing Constellations Mugs Cup Novelty Heat Activated Astronomy Physics Science Cup Package number: 1 Product material: Ceramic Microwave safe. Hand wash only. Pour in hot liquid and watch the constellations appear in the night sky. Includes: Cassiopea, Perseus, Saggitarius, Hercules, Andromeda, Scorpius, Taurus, Ursa Major, Ursa Minor, Orion, Castor & Pollux.