Reusable Seals for REGULAR MOUTH Mason Jar Lids.for Regular Mouth Mason Jars are 2 3/8 inch Internal Diameter and these REGULAR MOUTH sealing rings are seals are 70mm (2.75 inch) outside diameterLeak Proof, Air Tight, Durable, & Better Designed Designed for Ball storage caps,torage lids, and many other lids. Our rings are better than competitors by being made thicker and with a groove for a secure fit. The groove goes up, toward the top of the lid.these seals are dishwasher, freezer, and microwave safe VERSATILE: Perfect for fridge and freezer storage, , transporting food or beverage without leaking, home made fermenting lids, and much more Not for canning.One piece 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 will fix that Holding the lid under hot running water will help if you are having trouble removing the lidcolour:whiteMaterial:Silica gelsize:The regular mouth seals are 70mm outside diameterPackage Contents:48 x Gaskets Sealing Rings,Jars and Lids are not includedOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.