Basic structure of cup holder
Cup-shaped stem
The appearance of the cup stem is to prevent the hands of the drinker from touching the cup belly, in order to avoid making the glass flower or raising the temperature of the wine，  glass cookware .

Cup belly
The belly of a wine glass may be the most important component and also the most formalized. The shape and size of the cup belly affect the concentration and emission of aroma, the degree of ventilation, and the visual presentation effect of wine.
The most common shape is tulip shaped, characterized by a slightly wider bottom and a conical shape near the top. This shape allows people to shake the wine and observe, while the aroma is concentrated at the narrow opening, directly towards the nose. The glass used to drink full-bodied red wine is usually wide and round at the bottom, with the aim of allowing the wine to have more contact with the air, providing more space for the rich taste and aroma to emanate; The bottom of the glass for drinking white wine is relatively narrow, in order to help maintain the coolness of the wine and gather lighter aromas in a smaller space. Champagne glasses are thin and long to showcase the rising bubbles and help maintain low temperatures.
size
There are many shapes and sizes of wine glasses, but there is a rule of thumb that wine glasses should be large enough to have enough space to avoid the overflow of wine when shaking them, and the aroma can also be emitted and gathered in the glass.
colour
Although colored wine glasses or those with prominent decorations may look beautiful, the best wine glasses should be smooth, even, and allow the beauty and delicacy of the wine in the glass to be clearly displayed through the glass wall.
Cup mouth
A high-quality wine glass will have a cut mouth that feels smooth and will not hinder the wine from flowing out of the glass. It should be avoided to use wine glasses with rolled edges or uneven edges.