This 7 oz. Rocks glass features an narrower octagonal base for stacking, and has been treated with Libbey patented duratuff thermal after process for "pressed" tumblers, which gives the top portion of the glass maximum resistance to thermal and mechanical shock. When you see the embossed duratuff name on your product, it means you're getting the longest service life in the food service industry. Capacity: 7 oz. Height: 3-1/16 inch top diameter: 3-1/16 inch bottom diameter: 1-7/8 inch maximum diameter: 3-1/16 inch Scc#: 604302 duratuff treated use traex rack tr-12 with this Gibraltar duratuff stackable Rocks glass.