Glass jars specially designed and heat-treated for use in home canning and preserving. Ideal for fresh preserving recipes such as jams, jellies, sauces, mustards and flavored vinegars. The Quilted Crystal design adds a decorative touch to these multi-purpose jars—also use them for serving, creative décor, and gift-giving. Lids and bands are interchangeable with Ball or Kerr mason jars. These jars are not suitable for freezing.