Double-walled glass Set of 2 double-walled clear glass cups. Heat is not easily transferred, so you won't burn your hands when holding hot drinks. Also, heat doesn't escape easily, so both hot and cold drinks stay at their temperature longer. They also have the property of making ice less likely to melt. Diameter: Approximately 6 cm Height: Approximately 6.5 cm One glass has a manufacturing scratch on the inside. Thank you for looking.