Part of the WECK home Canning system. The WECK company has been sucessfully providing canning equipment in Europe since 1900. Home canning has become very popular and a healthy way to preserve foods, especially when produce is home grown. These wide easy to fill jars feature glass lids that will not rust, seals that are easy to check at a glance and best of all they are easy to stack. Note- this article includes only the rubber seals. Clamps, Jars and Lids are sold separately.