- Durable and Safe: Made from BPA-free food-grade silicone. No chemicals leach into foods. Long-lasting and reliable. - Reusable and Easy to Clean: Dishwasher, freezer, and microwave safe. Reuse over and over to reduce waste and save money. - Airtight and Leak-Proof on Regular-Mouth Mason Jars: Creates a tight, liquid-proof seal on most regular-mouth Mason jars for fermenting and canning without leaks. - Cost-Saving Replacement Gaskets: When seals wear out, replace the gaskets instead of buying a new lid. A replacement gasket set keeps you stocked and prevents downtime. - Compatibility and Performance: Fits most regular-mouth Mason jar lids. Delivers consistent sealing, helping preserve flavor and freshness. - Practical Use Scenarios: Ferment vegetables or fruits in regular-mouth jars with a secure seal; store homemade dressings, sauces, or broths in the fridge without leaks; re-seal jars for pantry or kitchen organization.