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In the results, heights run roughly from 2.95 inches up to 4.0 inches, while widths are about 4.0 to 5.4 inches.
Some listings note Prop 65 certification and mention packaging such as a die-cut box for shipping protection.
The listings explicitly mention stoneware and borosilicate glass; one title also uses the term “ceramic.”
Most listings explicitly state the mugs are suitable for both hot and cold beverages.