Glass jars specially designed and heat-treated for use in home canning. Ideal for fresh preserving recipes such as salsas, syrups, sauces, fruits and vegetables. Ball's famous glass jars and closures go beyond fresh preserving to help you with serving, creative décor, and gift-giving. Mason canning jars sold in pint and quart sizes. Includes one dozen jars, bands and lids. Caps, lids, and rings are interchangeable with Ball or Kerr mason jars. These jars are not suitable for freezing.