Nicely done Zwilling! I bought two sets of glasses, 9 and 14 oz. You see one from each set. I use the talls for iced tea, the smaller for scotch. They are elegant, insulate well, and lighter weight than the single wall glasses I have. double wall glasses must use thin, delicate glass or they will be too heavy. I do NOT recommend them for daily use, or for dishwasher. The rim is thicker than you are used to. There is a tiny 14 dot in every base, see close-up picture. A part of the manufacturing process, not a defect. Three dot is visible when liquid is in the glass. Consider this proof that it is indeed glass. My wife refused to believe it wasnt plastic. Enjoy drinks that look beautiful, stay cold, dont sweat, and dont add more plastic to this world.