FIT WELL The airtight silicone seal rings fit standard regular mouth mason jar lids (3 inches lids), You can select the mason jar with 0.35 Liter, 0.5 Liter, 1 Liter, 1.5 Liters, or 2 Liters container. The inside diameter is 2.7 inches (73 mm), the outside diameter is 3.8 inches (95 mm), and the thickness is 0.87 inches (2.2 mm). Being soft silicone, the gasket sealing rings for mason jar lids will stretch slightly to fit well. AIRTIGHT WELL The replacement silicone gaskets for your glass canisters could create an airtight environment on your preserve and canning jars. The silicone rubber rings can be used for leak proof sealing to keep your fruits crisp, vegetables, spices, herbs, jams, sauces, and beef jerky preserved. BPA FREE & DURABLE The airtight silicone seal rings are made of eco-friendly and food grade silica gel with long-lasting durability, which are very safe for you and your family when using. They are BPA free, freezer safe, heat tolerant, reusable, durable, and will not absorb flavors and odors. EASY REPLACEMENT The old rubber seals are easy to wear out after a long time use, you need to replace the seal ring to make it work better, airtight sealing, and protect your jars. You removed the old one, and replace the new one on the jars' lids within 1 minute. COLORFUL & MULTIFUNCTIONAL We offer colorful airtight silicone seal rings for identifying your jars. You can find other color seal rings on our store, which are great for daily storing, travelling, and storage of dehydrated food. Perfect for fridge and freezer storing, pantry storage, transporting food or beverage without leaking, homemade fermenting lids and so on.