The main materials of red wine glasses are crystal and glass. The aroma and taste brought by crystal cups and glasses will be slightly different, which is mainly caused by the different roughness of their surfaces. Through a microscope, it can be observed that the surface of the crystal has more concavities and convexities than that of the glass, and the glass is hung with more cups. When the glass is used to hold champagne, the bubbles will perform better. At the same time, the small concavities and convexities on the glass wall can retain these bubbles more durably, which is the soul of champagne.