These Ball Wide Mouth Lids and Bands help create a tight seal on your Regular Mouth canning jars. When heated during the canning process, the soft, BPA-free sealing material on the underside of lid seals in freshness and prevents oxygen and bacteria from entering the jar. If properly applied, the initial seal will maintain food quality for over a year.

• Ensures a tight seal for canning and storage purposes
• When canning, lid sealing material functionality is single-use only
• BPA-free