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hot sale 250ml food preserved glass jar wholesale glass canning jar hot sauce glass jar with metal cap A round glass jar is a cylindrical container made of glass with a round shape. It typically has a lid or a screw-on cap to seal the contents inside. Round glass jars are commonly used for storing food items such as jams, pickles, spices, and sauces. They can also be used for organizing small items like beads, buttons, or office supplies. The transparency of glass allows for easy visibility of the contents, making it convenient to identify and access what is stored inside the jar.