Great Gays Heat Changing Mug - Add Coffee or Tea and Famous Gays From History Come Out of the Closet - Comes in a Fun Gift Box When the mug is empty, it shows fourteen closet doors. But when you pour in a hot beverage, 14 of the world's most famous gays proudly emerge. Michelangelo, Michel Foucault, Freddie Mercury - see the product description below for a full list! 12 oz. ceramic mug. Comes in a colorful box. Color changing cups are microwave safe, but not dishwasher safe. Hand wash only. Don't soak. Click on "The Unemployed Philosophers Guild" above the product title to see more great gifts. UPG truly has presents of mind.