Leak Proof Platinum Silicone Sealing Lid Inserts/Liners for Mason Jars (10 Pack, Regular Mouth) 10 pack! These Reusable Silicone Discs Make *Regular Mouth* (2 3/8" internal diameter) Ball plastic storage caps, Mason Jar Lifestyle stainless steel storage lids, and some other lids both leak proof and food safe! Safest Material - Platinum cured silicone is more expensive and higher quality than peroxide cured silicone. Silicone rubber is a BPA free, non-plastic material for food use that does not leach any chemicals. Easy to Clean and Use - Dishwasher, freezer, and microwave safe! Now with a small tab to make them easier to remove. Multi Purpose - Work perfectly with metal bands, Ball plastic storage lids, or Mason Jar Lifestyle stainless steel storage lids. Because silicone is a flexible material, they fit some other lids too (but not perfectly). If they seem a little too big for your lid, you can trim them with a scissors. Many Uses - Perfect for storing anything in the pantry, fridge, or freezer. Prevent food contact with plastic or tin, line a straw hole lid for transport, replace your rusted metal flat lids, or line any type of cutout lid for candles or food. Not for canning.