- Includes 12 Leak-Proof Reusable Mason Jar Silicone Disc Gasket Lids. Bands Not Included. This Item is Not Sold in Retail-Ready Packaging. Delivers in a Plastic Bag with 12 Units per Bag. - Available in 2 Sizes Designed for Wide Mouth or Regular Mouth Canning Jars (Ball, Kerr, Bernardin, etc.) - Creates a Secure, Airtight and Leak-Proof Seal Every Time - Made from BPA-Free, Food-Safe Premium Silicone - Dishwasher, Freezer and Microwave Safe. Not Intended for Boiling for Heat Processing. - *Important!* This item is not sold in retail-ready packaging. It is delivered in a plastic bag with 12 units per bag.