Ball Mason jars are the right choice for canning and preserving. The included lids seal these canning jars so that no air enters the jar, thus preserving your food items. These jars are made of clear quality glass, so it is easy to identify the items you have. They can even be refrigerated. Mini 4oz 4pc- Miniature storage jars. Use to store and prominently display herbs and spices, fashion unique party favors or gifts, or organize your home decor. Includes 4 jars with silver lids.