CafePress - Librarian - Coffee Mug, Novelty Coffee Cup Standard White Coffee Mug is 3.75"x3", 11 oz capacity. As available, choose from: Black Color Changing Mug (3.75"x3", 11 oz) or Mega Coffee Mug (4.5"x3.75", 20 oz). Black Color Changing Mug is black (with design semi-hidden). When you pour hot liquid in, it reveals the white ceramic and your design. See photo for example! Durable ceramic with easy grip handle give a classic coffee mug look and feel. Coffee cup designs are professionally printed. Make someone smile with funny, cute, vintage, or expressive artwork. Microwave safe. Hand wash color-changing Magic Mug. White mugs are dishwasher safe for convenient care. IMPORTED.