These hand-crafted thermo-glass cups are made from double walled, insulated glass that keeps drinks hot or cold for longer, while remaining comfortable to hold. Beautiful minimalist styling is a perfect addition to your kitchen and home. 4-ounce size makes these cups perfect for a shot of espresso. The modern design lifts the espresso off of the bottom of the glass, giving it the perception of floating. Because of the nature and quality of the glass, handwashing is recommended.