These cups have been my gold standard for tasting and serving tea for years. They are dual walled and fit my glass brewing carafes quite nicely. I don’t have much I can say about them other than I buy them at retail, and that you could get a better price elsewhere if you shop around. I only put them here for your convenience. They’re Japanese made glass purchased from a shop I really like in Taiwan. They’re small, they can hold about 70ml.