Glass glasses are usually less expensive. Because the main component of glass is silicon dioxide, the molecule of this substance is not easy to chemical reaction with other substances, belongs to the inert material, and the glass is not breathable, so in the use of cup washing machine cleaning, not easy to residual detergent in the aromatic components or detergent corrosion. Crystal wine glasses are made by adding 2% to 30% minerals to the glass. The mineral, usually lead, strengthens the glass, making it both light and durable. Because the glass wall is thin and strong, when clinking glasses, the sound is very clear. Lead crystal glasses refract light very well, making them more transparent when viewing the liquor.