Standard 2-piece SNAP LID® 70 MM canning closures for all types of home canning and crafting. Package of 12 bands and lids. These metal SNAP lids and screw bands for mason jars seal home canned foods airtight. After heat processing and upon cooling, a vacuum is formed which seals the lids onto the jars. The lids are laquered to prevent rust and have an interior enamel coating to resist natural food acidity.