Lead-free wine glasses are a special type of wine glass commonly used for tasting high-quality wines and other liquors. They are called "lead-free" because they are manufactured in a way that reduces or completely eliminates the use of lead oxides to reduce potentially harmful effects on drinking liquids.

These glasses usually have the following characteristics:

1. Transparency: Glasses made of lead-free glass are more transparent, helping to show the color and clarity of the wine.

2. Fineness: They are usually thinner and lighter, helping to better convey the aroma and taste of the wine.

3. Wine taste: Lead-free glass glasses can reduce the potential contamination of lead, so as to better retain the pure taste of wine.

4. Texture: These glasses often have an elegant design to enhance the drinking experience.

It is important to note that lead-free glass glasses are generally more expensive because their manufacturing process is more complex and requires higher quality raw materials. Choosing whether to buy a lead-free glass glass usually depends on an individual's budget and appreciation of the wine.