High Quality Content by WIKIPEDIA articles! A Mason jar is a glass jar used in canning to preserve food. They were invented and patented by John L. Mason in 1858. They are also called Ball jars, after Ball Corp., a popular and early manufacturer of the jars; fruit jars because they are often used to store fruit; or generically glass canning jars. While largely supplanted by other methods for commercial mass-production, they are still commonly used in home canning. In modern usage, the terms often refer specifically to jars featuring a two-piece cover: An inner, flat, metal or glass lid, covered by a screw-on ring. The ring holds the lid in place during the canning process, which creates a partial vacuum, sealing the lid until opened. The lids are sold separately so that the jars and rings can be reused. Mason jars are made of soda-lime glass, and come in a variety of sizes including pint, quart, half-gallon, and cup sizes, as well as in wide-mouth and regular mouth shapes

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