these seals are dishwasher, freezer, and microwave safe! Reusable Seals for x REGULAR MOUTH x Jar Lids.for Regular Mouth Jars are 2 3/8 inch Internal Diameter and these x REGULAR MOUTH x sealing rings are seals are 70mm (2.75 inch) outside diameter Leak Proof, Air Tight, , & Better Designed! Designed for Ball storage caps,torage lids, and many other lids. Our rings are competitors by being made thicker and with a groove for a secure fit. The groove up, toward the top of the lid. VERSATILE: Perfect for fridge and freezer storage, pantry storage, transporting food or beverage without leaking, fermenting lids, and much more! Not for canning. plastic or metal storage lids are super convenient when you are storing things in the fridge or pantry, but most of them are not air tight and leak proof. These seals fix that!