Crystal wine glasses have the following characteristics:

1. Quality material: Crystal wine glasses are usually made of high-quality crystal materials, which makes the glass more transparent and smooth, and has good wear resistance.

2. Exquisite appearance: Crystal wine glasses are exquisitely designed, usually with delicate craftsmanship and gorgeous appearance. They often display distinctive cut patterns and elegant lines that make drinking wine more pleasant.

3. Good optical performance: Crystal wine glasses have excellent optical characteristics, which can transmit the color and texture of red wine. This helps to enhance the wine taste experience, making the wine more vivid and bright color.

4. Moderate weight: Crystal wine glasses usually have a moderate weight, which helps to provide better feel and stability, making the glass more comfortable and easy to operate when using.

In general, crystal wine glasses, with their high-quality materials, exquisite appearance and good optical properties, provide an elegant and pleasant way to drink red wine.