Glass stoppers are small, often decorative pieces made of glass that fit into the neck of a bottle or container. They are commonly used to seal bottles of liquids, such as wine, essential oils, or perfumes, helping to preserve the contents by preventing air from entering. The design of glass stoppers can vary, with some featuring a simple round shape while others may be more intricate. These stoppers are not only functional but also add an aesthetic appeal to the bottles they seal. Many collectors appreciate vintage glass stoppers for their craftsmanship and unique designs. In addition to their use in bottles, glass stoppers can also be found in laboratory settings, where they are used to seal glassware like flasks and test tubes.