Hidden skull at the bottom of your cup. The more you drink your coffee, the more he stares you down. The first one to blink loses. Creature emerges slowly as you drink 11 fluid ounce (325 ml) Exterior color is Black Made of hi-fire ceramics Dishwasher safe and microwavable Diameter: 4 inches (10 cm) / Height: 3.2 inches (8.0 cm) Weight: 0.7 lbs (0.3 kg) Every cup comes individually boxed making it easy to display and gift.