This item was received nearly 20 years ago and has been stored for a long time, displayed in a cabinet for a period. I don't recall using it, but when I shined a light on it, I noticed faint water droplet marks. Therefore, it's possible it was used once or twice, or the marks were made when it was washed before being put away in the cabinet. Please understand this before purchasing. (They are not visible under normal viewing.) wOOt! Rock Glasses, Pair 2 each of blue & purple, totaling 4 glasses They have air bubbles, resembling Ryukyu glass. The glass is also thick and has a slight weight. The size is approximately 9.5cm in both diameter and height. Immediate purchase is welcome. Product Description These rock glasses feature an overwhelming presence, a unique shape, and thick glass. They are perfect for cold drinks, as well as for enjoying whiskey or shochu on the rocks. The blue and purple combination, known for its enriching and highly healing effects, enhances the taste of your beverages. At the end of the day, enjoy a moment of peace with your own special glass, or share your favorite drinks with a loved one. The box can be used to store letters, photos, or special memories after you've taken out the product.